G2 SEC examination problems often become easier when learners eliminate impossible branches before fully solving every possibility. A unit, bound, source restriction, chronology rule or domain condition can prune whole families of answers.
This one-hundred-and-thirty-sixth Learner’s Guide develops branch-and-bound elimination across K200 English, K210 Mathematics and K223–K225 Science. It builds on Vol 0132 Option Value and Vol 0124 Constraint Stack.
The branch-and-bound protocol
Generate only plausible candidates, then apply the cheapest hard constraints first. Eliminate branches that violate units, source, chronology, domain, bounds or explicit conditions. Spend deeper reasoning only on survivors.
1. MCQ impossible unit
For MCQ impossible unit, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
2. MCQ impossible sign
For MCQ impossible sign, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
3. MCQ impossible magnitude
For MCQ impossible magnitude, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
4. MCQ wrong source
For MCQ wrong source, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
5. MCQ wrong chronology
For MCQ wrong chronology, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
6. MCQ wrong quantifier
For MCQ wrong quantifier, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
7. MCQ wrong modality
For MCQ wrong modality, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
8. MCQ wrong denominator
For MCQ wrong denominator, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
9. MCQ wrong graph interval
For MCQ wrong graph interval, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
10. MCQ wrong domain
For MCQ wrong domain, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
11. English referent candidate
For English referent candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
12. English meaning candidate
For English meaning candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
13. English inference candidate
For English inference candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
14. English tone candidate
For English tone candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
15. English purpose candidate
For English purpose candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
16. English source candidate
For English source candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
17. English chronology candidate
For English chronology candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
18. English summary point
For English summary point, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
19. English writing example
For English writing example, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
20. English paragraph route
For English paragraph route, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
21. Math root candidate
For Math root candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
22. Math case branch
For Math case branch, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
23. Math formula candidate
For Math formula candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
24. Math representation candidate
For Math representation candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
25. Math answer option
For Math answer option, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
26. Math integer candidate
For Math integer candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
27. Math geometric configuration
For Math geometric configuration, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
28. Math probability branch
For Math probability branch, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
29. Math bound interval
For Math bound interval, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
30. Math unit conversion direction
For Math unit conversion direction, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
31. Math comparison measure
For Math comparison measure, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
32. Math breakpoint region
For Math breakpoint region, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
33. Math parameter candidate
For Math parameter candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
34. Science mechanism candidate
For Science mechanism candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
35. Science causal explanation
For Science causal explanation, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
36. Science variable role
For Science variable role, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
37. Science control explanation
For Science control explanation, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
38. Science model
For Science model, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
39. Science anomaly explanation
For Science anomaly explanation, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
40. Science interaction model
For Science interaction model, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
41. Science bottleneck candidate
For Science bottleneck candidate, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
42. Science response-shape model
For Science response-shape model, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
43. Science path-dependence hypothesis
For Science path-dependence hypothesis, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
44. Science lag hypothesis
For Science lag hypothesis, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
45. Science baseline-drift hypothesis
For Science baseline-drift hypothesis, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
46. hard constraint pruning
For hard constraint pruning, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
47. soft preference ranking
For soft preference ranking, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
48. lower bound
For lower bound, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
49. upper bound
For upper bound, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
50. domain bound
For domain bound, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
51. unit bound
For unit bound, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
52. physical bound
For physical bound, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
53. logical contradiction
For logical contradiction, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
54. source contradiction
For source contradiction, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
55. time contradiction
For time contradiction, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
56. population contradiction
For population contradiction, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
57. representation contradiction
For representation contradiction, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
58. case exhaustion
For case exhaustion, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
59. candidate ordering
For candidate ordering, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
60. cheap elimination first
For cheap elimination first, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
61. high-information test
For high-information test, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
62. discriminating clue
For discriminating clue, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
63. branch preservation
For branch preservation, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
64. branch closure
For branch closure, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
65. branch reopening
For branch reopening, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
66. false elimination
For false elimination, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
67. premature elimination
For premature elimination, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
68. too many branches
For too many branches, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
69. branch compression
For branch compression, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
70. bound tightening
For bound tightening, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
71. new evidence tightens bound
For new evidence tightens bound, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
72. verification tightens bound
For verification tightens bound, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
73. final candidate set
For final candidate set, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
74. single survivor
For single survivor, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
75. multiple survivors
For multiple survivors, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
76. bounded answer
For bounded answer, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
77. branch-and-bound final rule
For branch-and-bound final rule, list the candidate branches and identify one hard bound capable of eliminating at least one branch without completing every calculation or interpretation.
For practice, rank the available tests by cost and pruning power. A good early test is cheap and removes many candidates. A costly test that distinguishes only two already unlikely branches should usually wait.
Never eliminate a branch using a soft preference as if it were a hard rule. If the evidence only makes a candidate less likely, keep it available until a genuine contradiction, bound or stronger comparison closes it.
Bounding can be qualitative
A bound need not always be numerical. “Must come from Text 2”, “must occur before the decision”, “must be positive”, and “must explain the control result” are all constraints that can prune candidates.
Links
Use the Examination Craft hub, Vol 0128 Reversible vs Irreversible Moves, the relevant English, Mathematics and Science hubs, and the PSLE Learner’s Guide.
Official-source discipline
For the 2027 SEC G2 school-candidate framework, use the current SEAB G2 syllabus directory and linked subject syllabuses. Branch-and-bound elimination is an eduKateSengkang examination framework, not an SEAB marking label.
Final rule
Do not solve every branch equally. Use hard constraints to shrink the candidate set, preserve branches that remain genuinely possible, and spend deep effort only where the surviving alternatives still need separation.
