The 20-route learning estate
eduKateSengkang is organised as a Learning Castle: existing subject hubs, level routes, examination routes and learning-system pages retain their jobs. This page is the master upgrade directory. It does not replace those owners. It makes the work visible, assigns every upgrade to one route, and gives new or substantially revised articles stable IDs so later batches can be connected without losing track of what is complete.
Numbering rule
Each route has a -000 hub pointer. Article slots then use reserved tens: -010, -020, -030 and so on. The first upgrade programme reserves up to 150 article slots per route, ending at -1500. Existing high-value URLs are upgraded in place wherever practical; the ID identifies the editorial job, not a requirement to create a new URL.
| Route | Hub ID | Primary job | Existing owner / destination | Reserved article IDs | Status |
|---|---|---|---|---|---|
| SK-01 | SK-01-000 | Homepage, Sengkang Tuition, commercial/navigation/root accuracy | Homepage / Tuition Centre owner | SK-01-010–SK-01-1500 | OPEN |
| SK-02 | SK-02-000 | Primary 1–3 English | Primary English Learning Hub | SK-02-010–SK-02-1500 | OPEN |
| SK-03 | SK-03-000 | Primary 4–6 English + PSLE English | Primary English Learning Hub / PSLE Learning Guide | SK-03-010–SK-03-1500 | OPEN |
| SK-04 | SK-04-000 | Secondary 1–2 English | English Hub | SK-04-010–SK-04-1500 | OPEN |
| SK-05 | SK-05-000 | Secondary 3–4 English + SEC English | English Hub | SK-05-010–SK-05-1500 | OPEN |
| SK-06 | SK-06-000 | Vocabulary, grammar, reading, writing and English skills | Complete English Index | SK-06-010–SK-06-1500 | OPEN |
| SK-07 | SK-07-000 | Primary 1–3 Mathematics | Mathematics Hub | SK-07-010–SK-07-1500 | OPEN |
| SK-08 | SK-08-000 | Primary 4–6 Mathematics + PSLE Mathematics | Mathematics Hub / PSLE Learning Guide | SK-08-010–SK-08-1500 | OPEN |
| SK-09 | SK-09-000 | Secondary 1–2 Mathematics | Mathematics Hub | SK-09-010–SK-09-1500 | OPEN |
| SK-10 | SK-10-000 | Secondary 3–4 Mathematics + SEC Mathematics | Mathematics Hub | SK-10-010–SK-10-1500 | OPEN |
| SK-11 | SK-11-000 | Additional Mathematics | Additional Mathematics owner | SK-11-010–SK-11-1500 | OPEN |
| SK-12 | SK-12-000 | Primary 3–4 Science | Science Hub | SK-12-010–SK-12-1500 | OPEN |
| SK-13 | SK-13-000 | Primary 5–6 Science + PSLE Science | Science Hub / PSLE Science Learning Guide | SK-13-010–SK-13-1500 | OPEN |
| SK-14 | SK-14-000 | Secondary Science + scientific reasoning | Science Hub | SK-14-010–SK-14-1500 | OPEN |
| SK-15 | SK-15-000 | Learning Castle, Learning Runtime and study methods | Learning Runtime Hub | SK-15-010–SK-15-1500 | OPEN |
| SK-16 | SK-16-000 | Examination performance, revision, assessment and error repair | Examination Craft | SK-16-010–SK-16-1500 | OPEN |
| SK-17 | SK-17-000 | Parent guides, tuition, teaching and student support | Parents’ Guide | SK-17-010–SK-17-1500 | OPEN |
| SK-18 | SK-18-000 | Algorithms, computing and advanced mathematics | Algorithms & Computing Hub | SK-18-010–SK-18-1500 | OPEN |
| SK-19 | SK-19-000 | Advanced science and world-knowledge science material | Complete Science Index | SK-19-010–SK-19-1500 | OPEN |
| SK-20 | SK-20-000 | Estate archaeology: duplication, location leakage, orphan control, cannibalisation and consolidation candidates | Learning Castle Registry | SK-20-010–SK-20-1500 | OPEN |
Article register
The first-wave titles and status ledger are live in the eduKate Sengkang Article Register | SK-01 to SK-20. Use it to claim the next article ID, see protected owners and avoid duplicating work already active in another branch.
Protection-first reader standard
All 20 branches now follow the eduKate Sengkang Reader Experience Standard: protect strong pages, connect isolated pages, improve formatting only where it helps, use bounded surgery for specific defects, and modernise only when the existing article no longer completes its reader job.
Article state
Every inspected URL receives one state before work begins: PROTECT for ranking or strategically sensitive owners; KEEP for sound pages needing no substantial rewrite; MODERNISE for useful but outdated pages; SURGERY for small bounded repairs; RETARGET for pages that need a distinct adjacent search job; CONSOLIDATION CANDIDATE for overlapping intent that requires owner review; LOCATION LEAKAGE for misplaced locality; or HISTORICAL for material worth preserving without major reinvestment.
Completion rule
An article ID becomes complete only when the assigned existing URL or new article has a defined reader job, correct owner, current factual scope, useful internal return path and no unresolved collision with another Sengkang owner. A branch can therefore inspect more than 150 URLs without rewriting 150 pages. The 150 slots are a controlled first-wave capacity, not a quota.
Castle relationship
This programme sits under the existing Learning Castle and follows its one-owner-many-routes rule. English, Mathematics, Science, Examination Craft, Learning Runtime and Algorithms retain their existing canonical roles. The master directory exists to coordinate upgrades and make unfinished work visible; it does not create twenty competing subject hubs.
Complete-index crosswalk
Use the 20 routes above to decide ownership and upgrade work. Use these Complete Archives when the job is enumeration, orphan control or direct deep-article discovery.
English Archive · Mathematics Archive · Science Archive · Examination Archive · Learning Runtime Archive · Algorithms & Computing Archive
Deep fallback discovery
The subject hubs and Complete Archives remain the preferred routes. These live indexes are the final orphan-control layer: they expose every published Page and Post through paginated internal links so newly published or unusually placed content still has a crawlable return path while specialist routing is updated.
Browse every published Page
2756 results found
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Primary 4 Mathematics Learning Guide | Angles, Protractor Reading, Symmetry and Spatial Construction
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Primary 4 Mathematics Learning Guide | Area, Perimeter, Angles, Symmetry and Nets
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Primary 4 Mathematics Learning Guide | Assumption Method: Supposition, Excess, Difference and Word Problems
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Primary 4 Mathematics Learning Guide | Before-and-After Problems: Unknown Start, Change and Final Quantity
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Primary 4 Mathematics Learning Guide | Composite Figures, Missing Lengths and Boundary Tracing
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Primary 4 Mathematics Learning Guide | Constant Difference: Equal Changes, Comparison and the Gap That Stays the Same
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Primary 4 Mathematics Learning Guide | Constant Total: Transfers, Redistribution and the Quantity That Does Not Change
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Primary 4 Mathematics Learning Guide | Data, Word Problems, Strategy Choice and Self-Checking
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Primary 4 Mathematics Learning Guide | Decimal Measurement, Place Value and Rounding Accuracy
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Primary 4 Mathematics Learning Guide | Diagnostic Assessment, Capability Profile and Repair Routing
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Primary 4 Mathematics Learning Guide | Division, Remainders, Equal Grouping and Quotient Interpretation
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Primary 4 Mathematics Learning Guide | Equal Concept: Equal at First, Equal at End and Before–After Models
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Primary 4 Mathematics Learning Guide | Error Atlas, Misconceptions, First Weak Link and Correction
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Primary 4 Mathematics Learning Guide | Factors, Multiples, Common Factors and Common Multiples
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Primary 4 Mathematics Learning Guide | Fraction Addition, Subtraction, Common Denominators and Mixed Contexts
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Primary 4 Mathematics Learning Guide | Fraction Word Problems, Reference Wholes and Mixed Numbers
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Primary 4 Mathematics Learning Guide | Fractions, Decimals and Number Relationships
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Primary 4 Mathematics Learning Guide | Grouping Concept: Quantity × Value, Equal Sets and Regrouping
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Primary 4 Mathematics Learning Guide | Home Learning, Homework Independence and Parent Support
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Primary 4 Mathematics Learning Guide | Length: Kilometres, Metres, Centimetres and Compound Units
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Primary 4 Mathematics Learning Guide | Mass: Kilograms, Grams and Compound Units
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Primary 4 Mathematics Learning Guide | Mathematical Communication, Complete Working and Explanation
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Primary 4 Mathematics Learning Guide | Mixed Problem Laboratory, Interleaving and Transfer
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Primary 4 Mathematics Learning Guide | Mixed-Topic Problems, Representation Choice and Error Recovery
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Primary 4 Mathematics Learning Guide | Money in Decimal Notation, Change, Budgeting and Word Problems
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Primary 4 Mathematics Learning Guide | Multiple Solution Routes: Choosing, Comparing and Verifying Mathematics Strategies
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Primary 4 Mathematics Learning Guide | Multiplicative Comparison, Bar Models and Unknown Units
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Primary 4 Mathematics Learning Guide | Nets, 2D Representations and 3D Spatial Reasoning
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Primary 4 Mathematics Learning Guide | Number Sequences, Rounding, Estimation and Approximation
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Primary 4 Mathematics Learning Guide | Part-Whole, Difference and Equal-Group Models: Choosing the Correct Bar Model
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Primary 4 Mathematics Learning Guide | Patterns and Generalisation: Observe, Predict, Test and Explain
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Primary 4 Mathematics Learning Guide | Practice Paper: Arithmetic, Reasoning and Mixed Review with Worked Solutions
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Primary 4 Mathematics Learning Guide | Problem Posing, Changing Conditions and Creating Valid Questions
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Primary 4 Mathematics Learning Guide | Repeated Identity: Linked Comparisons, Shared Quantity and Model Drawing
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Primary 4 Mathematics Learning Guide | Revision Strategy: Topic Checklist, Weak-Link Repair and Assessment Readiness
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Primary 4 Mathematics Learning Guide | Shortage and Surplus: Excess, Deficit, Fixed Groups, Left Over and Short Of
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Primary 4 Mathematics Learning Guide | Simplifying Problems: Smaller Numbers, Simpler Cases and Rebuilding the Original
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Primary 4 Mathematics Learning Guide | Single Unchanged Quantity: Constant Single Subject and Before–After Reasoning
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Primary 4 Mathematics Learning Guide | Special Cases, Boundaries, Counterexamples and Impossible Cases
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Primary 4 Mathematics Learning Guide | Speed and Accuracy: Efficient Working, Pacing and Error Prevention
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Primary 4 Mathematics Learning Guide | Systematic Listing, Tables and Guess-and-Check
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Primary 4 Mathematics Learning Guide | Tables, Line Graphs, Pie Charts and Scale Reading
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Primary 4 Mathematics Learning Guide | Translating Representations: Words, Tables, Number Lines, Bar Models and Equations
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Primary 4 Mathematics Learning Guide | Unitary Method: One Unit, Fractional Part, Find the Whole and Scale Up
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Primary 4 Mathematics Learning Guide | Volume of Liquid: Litres, Millilitres and Compound Units
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Primary 4 Mathematics Learning Guide | Whole Numbers, Factors, Multiples and the Four Operations
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Primary 4 Mathematics Learning Guide | Working Backwards: Inverse Operations and Missing Quantities
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Primary 4 Mathematics Learning Hub | Number, Fractions, Geometry, Data and Problem Solving
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Primary 4 Mathematics Sengkang | The Voyage of Water
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Primary 4 Mathematics Sengkang | Upper-Primary Straddle Diagnostic
Browse every published Post
3746 results found
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PSLE Science Reality Lab Vol No.072 | “Removes 99%” — 99% of What Was There at the Start, and What Is Left?
10–15 minutes -
PSLE Science Reality Lab Vol No.071 | “Tested for 10,000 Cycles” — Does an Accelerated Test Prove Years of Normal Use?
11–17 minutes -
PSLE Science Reality Lab Vol No.070 | “Three Sensors Agree” — Can They All Share the Same Bias?
12–18 minutes -
The Tutor Handbook Vol No.0107 | The Peer Baseline Trap — How a Tutor Uses Three Learners Together Without Letting the Fastest Student Become the Standard for Everyone Else
16–24 minutes -
The Tutor Handbook Vol No.0106 | The Evidence Source Gate — How a Tutor Decides Whether Research, Guidance, a Vendor Claim or a Viral Teaching Idea Deserves a Trial
16–24 minutes -
The Tutor Handbook Vol No.0105 | The Tutor Capacity Boundary — How a Tutor Protects Enough Preparation, Observation and Follow-Up Attention Before Taking On More Learners or More Work
17–26 minutes -
The Tutor Handbook Vol No.0104 | The AI Material Verification Gate — How a Tutor Uses Generative AI to Draft Questions, Explanations and Feedback Without Letting Unverified Output Reach the Learner
19–29 minutes -
PSLE Science Reality Lab Vol No.069 | “This Time-Lapse Shows Fast Change” — Did the Video Speed Change the Apparent Rate?
9–13 minutes -
PSLE Science Reality Lab Vol No.068 | “The Result Is Robust” — Did It Survive Other Reasonable Ways of Analysing the Same Data?
11–16 minutes -
PSLE Science Reality Lab Vol No.067 | “Within Tolerance” — Does Passing the Limit Mean the Measurement Is Exactly on Target?
8–13 minutes -
PSLE Science Reality Lab Vol No.066 | “This Image Was Enhanced” — Did Processing Reveal a Feature or Create an Artifact?
11–16 minutes -
The Tutor Handbook Vol No.0103 | The Coaching Focus Gate — How a Tutor Coach Chooses One High-Leverage Teaching Move to Improve Without Turning Observation Into a Checklist
22–33 minutes -
The Tutor Handbook Vol No.0102 | The Preparation–Adaptation Boundary — How a Tutor Plans a Coherent Lesson Without Pre-Deciding What the Learner Will Need
12–18 minutes -
The Tutor Handbook Vol No.0101 | The Expectation Reset — How a Tutor Stops Old Labels, Previous Marks and First Impressions From Deciding What Fresh Work Means
14–21 minutes -
The Tutor Handbook Vol No.0100 | The Task Purity Check — How a Tutor Separates the Target Skill From Reading Load, Format, Memory Demand and Other Hidden Requirements Before Calling the Skill Weak
16–24 minutes -
PSLE Science Reality Lab Vol No.065 | “Open Data Available” — Does That Mean the Result Has Already Been Reproduced?
9–14 minutes -
PSLE Science Reality Lab Vol No.064 | “The Data Were Adjusted” — What Was Changed, and Why?
9–14 minutes -
PSLE Science Reality Lab Vol No.063 | “Vegetation Health Index” — Did the Satellite Measure Plant Health Directly?
9–14 minutes -
PSLE Science Reality Lab Vol No.062 | “30 m Resolution” — Does One Pixel Describe a Single Point or a Whole Patch?
11–16 minutes -
The Tutor Handbook Vol No.0099 | The Question Return Gate — How a Tutor Decides When to Answer a Learner’s Question, Clarify It, or Hand Part of It Back for Independent Thinking
18–27 minutes -
The Tutor Handbook Vol No.0098 | The Revoicing Boundary — How a Tutor Restates a Learner’s Thinking Without Quietly Upgrading a Weak Answer Into a Strong One
17–26 minutes -
The Tutor Handbook Vol No.0097 | The Follow-Up Question — How a Tutor Responds to a Partly Correct Answer Without Feeding the Learner the Route
18–27 minutes -
The Tutor Handbook Vol No.0096 | The Correction Load Gate — How a Tutor Chooses Which Errors to Correct Now Without Turning One Piece of Work Into an Unusable Wall of Feedback
20–29 minutes -
PSLE Science Reality Lab Vol No.061 | “Near Real-Time Data” — Is This the Final Science-Quality Result?
9–14 minutes -
PSLE Science Reality Lab Vol No.060 | “10,000 Sightings on the Map” — Did People Look Equally Everywhere?
10–14 minutes -
PSLE Science Reality Lab Vol No.059 | “Warmest on Record” — Does Rank Tell You How Big the Difference Was?
6–8 minutes -
The Tutor Handbook Vol No.0095 | The Evidence Freshness Window — How a Tutor Decides When a Correct Answer Is Too Close to Teaching, Hinting or Rehearsal to Count as Independent Learning
17–26 minutes -
PSLE Science Reality Lab Vol No.058 | “2°C Warmer Than Normal” — Normal Compared With Which Years?
8–12 minutes -
The Tutor Handbook Vol No.0094 | The Peer Answer Leakage Boundary — How a Tutor Uses Student Discussion Without Destroying the Next Learner’s Independent Evidence
17–26 minutes -
The Tutor Handbook Vol No.0093 | The Cue Validity Check — How a Tutor Separates Evidence of the Target Skill From Distracting Signals Such as Neatness, Confidence, Effort and Familiarity
15–23 minutes -
The Tutor Handbook Vol No.0092 | The Disconfirmation Check — How a Tutor Tests a Competing Explanation Before Committing More Time to the Current Diagnosis
15–23 minutes -
PSLE Science Reality Lab Vol No.057 | “10.0 ± 0.5” — Does the ± Part Matter to the Claim?
8–12 minutes -
PSLE Science Reality Lab Vol No.056 | “Observed Every Two Days” — Was the Land Being Watched Continuously?
9–13 minutes -
PSLE Science Reality Lab Vol No.055 | “Representative Image” — How Was This One Picture Chosen From the Whole Experiment?
9–14 minutes -
PSLE Science Reality Lab Vol No.054 | “Calibrated Last Month” — Does That Guarantee Today’s Reading Is Still Right?
8–12 minutes -
The Tutor Handbook Vol No.0091 | The Observation Window — How a Tutor Coach Collects Enough Live Teaching Evidence Before Giving Feedback Without Turning the Lesson Into Performance Theatre
15–23 minutes -
The Tutor Handbook Vol No.0090 | The Interrupted Route — How a Tutor Restarts Learning After Missed Sessions Without Cramming, Resetting or Mistaking Absence for Forgetting
19–29 minutes -
The Tutor Handbook Vol No.0089 | The Diagnostic Probe — How a Tutor Designs One Question That Separates Competing Explanations Without Teaching the Answer
16–24 minutes -
The Tutor Handbook Vol No.0088 | The Tutor Reassignment Gate — How a Tutor Decides When Consistency Should Yield to a Better Fit Without Resetting the Learner
18–27 minutes -
PSLE Science Reality Lab Vol No.053 | “One Test Worked” — How Many Other Tests Were Tried?
11–16 minutes -
PSLE Science Reality Lab Vol No.052 | “Randomized Test” — What Was Actually Random?
10–15 minutes -
PSLE Science Reality Lab Vol No.051 | “Tested by an Accredited Laboratory” — Accredited for This Exact Test?
10–15 minutes -
PSLE Science Reality Lab Vol No.050 | “Traceable to a National Standard” — Does That Mean the Product Is Endorsed?
11–17 minutes -
The Tutor Handbook Vol No.0087 | The Evidence Triangulation Check — How a Tutor Combines School Results, Session Work and Learner Reports Without Averaging Unlike Evidence Into a Fake Score
17–26 minutes -
The Tutor Handbook Vol No.0086 | The Participation Differential — How a Tutor Separates Confusion, Access Barriers, Overload and Avoidance Before Calling a Learner Disengaged
17–25 minutes -
The Tutor Handbook Vol No.0085 | The Relationship Repair — How a Tutor Rebuilds Working Trust After Friction Without Lowering the Learning Standard
17–26 minutes -
The Tutor Handbook Vol No.0084 | The Dosage Differential — How a Tutor Distinguishes Too Little Tutoring From the Wrong Tutoring Before Adding More Sessions
18–27 minutes -
PSLE Science Reality Lab Vol No.049 | “The Test Found Nothing” — Did a Positive Control Show It Could Find Something?
12–18 minutes -
PSLE Science Reality Lab Vol No.048 | “The Trend Jumps Here” — Did the Measuring Method Change?
9–13 minutes -
PSLE Science Reality Lab Vol No.047 | “Three Studies Agree” — Did They All Use the Same Dataset?
9–14 minutes
Routing rule: use this fallback only for discovery and orphan control. Canonical subject ownership, reader pathways and return logic continue to come from the Learning Castle, subject hubs and Complete Archives.
