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
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How to Learn Basic English (Chinese Edition) | Lesson No.021 | Yesterday and Past Time | 昨天与过去时间
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How to Learn Basic English (Chinese Edition) | Lesson No.022 | Work and School | 工作与学校
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How to Learn Basic English (Chinese Edition) | Lesson No.023 | Phones and Messages | 电话与信息
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How to Learn Basic English (Chinese Edition) | Lesson No.024 | Invitations and Social English | 邀请与社交英语
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How to Learn Basic English (Chinese Edition) | Lesson No.025 | Reading Signs and Notices | 标志与通知
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How to Learn Basic English (Chinese Edition) | Lesson No.026 | Forms and Personal Information | 表格与个人信息
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How to Learn Basic English (Chinese Edition) | Lesson No.027 | Problems and Solutions | 问题与解决
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How to Learn Basic English (Chinese Edition) | Lesson No.028 | Review and Real-Life English | 复习与真实英语
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How to Learn Basic English (Chinese Edition) | Lesson No.029 | Listening to Everyday English | 听懂日常英语
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How to Learn Basic English (Chinese Edition) | Lesson No.030 | Reading Short Messages and Emails | 阅读短信息与邮件
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How to Learn Basic English (Chinese Edition) | Lesson No.031 | Writing Useful Short Messages | 写实用短信息
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How to Learn Basic English (Chinese Edition) | Lesson No.032 | Speaking with Confidence and Repair | 自信口语与交流修复
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How to Learn Basic English (Chinese Edition) | Lesson No.033 | Building Sentences from Chunks | 用语块造句
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How to Learn Basic English (Chinese Edition) | Lesson No.034 | Everyday Grammar Patterns | 日常英语语法模式
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How to Learn Basic English (Chinese Edition) | Lesson No.035 | Growing Vocabulary by Word Families | 用词族扩展词汇
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How to Learn Basic English (Chinese Edition) | Lesson No.036 | From A1 to A2 | 从 A1 走向 A2
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How to Learn Basic English (Chinese Edition) | Lesson No.037 | Present Perfect for Life Experience | 用现在完成时谈经历
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How to Learn Basic English (Chinese Edition) | Lesson No.038 | Longer Everyday Conversations | 更长的日常对话
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How to Learn Basic English (Chinese Edition) | Lesson No.039 | Reading Everyday Stories and Articles | 阅读日常故事与文章
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How to Learn Basic English (Chinese Edition) | Lesson No.040 | Writing Connected Paragraphs | 写连贯段落
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How to Learn Basic English (Chinese Edition) | Lesson No.041 | Making Comparisons and Choices | 比较与选择
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How to Learn Basic English (Chinese Edition) | Lesson No.042 | Giving Reasons, Opinions and Advice | 原因、观点与建议
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How to Learn Basic English (Chinese Edition) | Lesson No.043 | Past Stories with Background and Events | 用背景与事件讲过去故事
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How to Learn Basic English (Chinese Edition) | Lesson No.044 | A2 Review and Independent English | A2 复习与独立英语
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How to Learn Basic English (Chinese Edition) | Lesson No.045 | Present Perfect with For and Since | 用 for 和 since 表持续时间
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How to Learn Basic English (Chinese Edition) | Lesson No.046 | First Conditional for Real Plans | 第一条件句与真实计划
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How to Learn Basic English (Chinese Edition) | Lesson No.047 | Relative Clauses for Clearer Description | 用关系从句补充说明
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How to Learn Basic English (Chinese Edition) | Lesson No.048 | From A2 to B1 | 从 A2 走向 B1
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How to Learn Basic English (Chinese Edition) | Lesson No.049 | Second Conditional for Hypothetical Situations | 第二条件句与假设情况
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How to Learn Basic English (Chinese Edition) | Lesson No.050 | Phrasal Verbs in Everyday English | 日常英语短语动词
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How to Learn Basic English (Chinese Edition) | Lesson No.051 | Summarising and Note-Taking | 总结与笔记
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How to Learn Basic English (Chinese Edition) | Lesson No.052 | B1 Conversation and Connected Thinking | B1 对话与连贯思考
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How to Learn Basic English (Chinese Edition) | Lesson No.053 | Present Perfect Continuous | 现在完成进行时
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How to Learn Basic English (Chinese Edition) | Lesson No.054 | Reported Speech for Everyday Information | 日常转述
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How to Learn Basic English (Chinese Edition) | Lesson No.055 | Passive Voice in Everyday English | 日常英语被动语态
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How to Learn Basic English (Chinese Edition) | Lesson No.056 | B1 Reading and Writing Integration | B1 阅读写作整合
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How to Learn Basic English (Chinese Edition) | Lesson No.057 | Past Perfect for Earlier Past | 用过去完成时表达更早的过去
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How to Learn Basic English (Chinese Edition) | Lesson No.058 | Modals of Possibility and Deduction | 可能性与推断
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How to Learn Basic English (Chinese Edition) | Lesson No.059 | Formal and Informal English | 正式与非正式英语
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How to Learn Basic English (Chinese Edition) | Lesson No.060 | B1 Review and Real-World Performance | B1 复习与真实表现
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How to Learn Basic English (Chinese Edition) | Lesson No.061 | Gerunds and Infinitives in Everyday English | 动名词与不定式
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How to Learn Basic English (Chinese Edition) | Lesson No.062 | Third Conditional for Past Hypotheticals | 第三条件句与过去假设
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How to Learn Basic English (Chinese Edition) | Lesson No.063 | Linking Ideas Across Longer Texts | 长文本中的观点连接
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How to Learn Basic English (Chinese Edition) | Lesson No.064 | From B1 to B2 | 从 B1 走向 B2
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How to Learn Basic English (Chinese Edition) | Lesson No.065 | Mixed Conditionals and Time Relationships | 混合条件句与时间关系
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How to Learn Basic English (Chinese Edition) | Lesson No.066 | Advanced Modal Meaning and Stance | 高级情态意义与立场
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How to Learn Basic English (Chinese Edition) | Lesson No.067 | Paraphrasing Without Changing Meaning | 不改变原意的改写
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How to Learn Basic English (Chinese Edition) | Lesson No.068 | B2 Discussion, Argument and Evidence | B2 讨论、论证与证据
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How to Learn Basic English (Chinese Edition) | Lesson No.069 | Advanced Relative Clauses and Reduced Clauses | 高级关系从句与简化从句
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How to Learn Basic English (Chinese Edition) | Lesson No.070 | Nominalisation and Information Density | 名词化与信息密度
Browse every published Post
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How to Learn Electron Beam-Induced Current (EBIC): From Electron–Hole Generation and Junction Collection to Diffusion Length, Defect Imaging and Ultrafast Semiconductor Metrology
4–6 minutes -
How to Learn Methanogenesis and Methyl-Coenzyme M Reductase: From Archaeal Carbon Chemistry to Methane Cycling and Reverse Methanogenesis
9–13 minutes -
How to Learn Deep-Level Transient Spectroscopy (DLTS): From Semiconductor Traps and Capacitance Transients to Activation Energy, Defect Concentration and Wide-Bandgap Reliability
5–7 minutes -
How to Learn Anammoxosomes and Ladderane Membranes: From Anaerobic Ammonium Oxidation to Nitrogen Loss and Unique Organelle Chemistry
9–13 minutes -
How to Learn Kelvin Probe Force Microscopy (KPFM): From Contact Potential Difference to Work Function, Band Bending, Surface Photovoltage and Dynamic Charge Mapping
4–6 minutes -
How to Learn Polyphosphate and Acidocalcisomes: From Phosphate Chains to Cellular Storage, Stress Chemistry and Biological Phosphorus Removal
9–13 minutes -
How to Learn X-Ray Standing Wave (XSW/NIXSW): From Bragg Interference and Element-Specific Yield to Adsorption Heights, Interface Registry and Structural Reconstruction
4–6 minutes -
How to Learn Scanning Thermal Microscopy (SThM): From Thermal AFM Probes to Nanoscale Temperature, Conductivity and Subsurface Heat-Flow Mapping
4–6 minutes -
How to Learn Bacterial Ribosome Hibernation: From 70S Translation Machines to 100S Ribosome Storage, Stress Survival and Recovery
9–13 minutes -
How to Learn Grazing-Incidence Wide-Angle X-Ray Scattering (GIWAXS): From Grazing Geometry and Reciprocal Space to Thin-Film Texture, Crystallisation and Operando Structure
4–6 minutes -
How to Learn Chlorosomes and Extreme Low-Light Photosynthesis: From Self-Assembled Bacteriochlorophyll Antennas to Exciton Transfer
9–13 minutes -
How to Learn Ferromagnetic Resonance (FMR/VNA-FMR): From Magnetization Precession and Kittel Modes to Damping, Spin Pumping and Nonlinear Spin Dynamics
4–7 minutes -
How to Learn Bacterial Hopanoids: From Squalene Cyclization to Membrane Mechanics, Symbiosis and Molecular Fossils
9–13 minutes -
How to Learn Low-Energy Electron Diffraction (LEED): From Surface Reciprocal Lattices and Diffraction Spots to Reconstructions, I–V Structure Refinement and Micro-LEED
5–8 minutes -
How to Learn Transient Absorption Spectroscopy (TAS): From Pump–Probe ΔA to Excited-State Dynamics, Charge Transfer, Global Analysis and Ultrafast Materials
5–8 minutes -
How to Learn Biological Ice Control: From Bacterial Ice-Nucleation Proteins to Antifreeze Proteins, Cloud Freezing and Cryobiology
10–15 minutes -
How to Learn Neutron Spin Echo Spectroscopy (NSE/NRSE/MIEZE): From Larmor Precession and Spin Echoes to Nanosecond Polymer, Membrane and Magnetic Dynamics
5–7 minutes -
How to Learn Bioluminescence and Luciferase Chemistry: From Excited-State Molecules to Bacterial Lux Systems, Firefly Light and Deep-Sea Signalling
9–14 minutes -
How to Learn Auger Electron Spectroscopy (AES) and Scanning Auger Microscopy: From Core-Hole Relaxation to Nanometre Surface Chemistry, Depth Profiles and In-Situ Interfaces
4–7 minutes -
How to Learn Microwave Impedance Microscopy (MIM/SMM): From Near-Field Microwave Reflection to Nanoscale Conductivity, Permittivity and Quantum-Materials Imaging
5–7 minutes -
How to Learn Hydrogenosomes and Mitosomes: From Mitochondrial Ancestry to Anaerobic ATP, Fe–S Assembly and Organelle Reduction
8–13 minutes -
How to Learn AFM-IR and Photothermal Induced Resonance (PTIR): From Infrared Absorption and Thermal Expansion to Nanoscale Chemical Spectroscopy and Multimodal Materials Mapping
5–8 minutes -
How to Learn Extracellular Electron Transfer and Microbial Nanowires: From Redox Respiration to Cytochrome Conduits, Conductive Biofilms and Electromicrobiology
10–15 minutes -
How to Learn the Hough Line Transform: Parameter Space, Accumulators, Voting, Peak Detection and Robust Computer Vision
7–11 minutes -
How to Learn Photoelectron Emission Microscopy (PEEM/XPEEM): From Photoemission and Electron Optics to Work-Function, Chemical, Magnetic and Ultrafast Surface Imaging
5–7 minutes -
How to Learn the Smith–Waterman Algorithm: Local Alignment, Dynamic Programming, Gap Penalties, Traceback and SIMD Acceleration
6–9 minutes -
How to Learn the Miller–Rabin Primality Test: Modular Exponentiation, Witnesses, Strong Pseudoprimes and Error Bounds
6–8 minutes -
How to Learn the Nelder–Mead Algorithm: Simplexes, Reflection, Expansion, Contraction, Shrinkage and Derivative-Free Optimisation
7–10 minutes -
How to Learn X-Ray Magnetic Circular Dichroism (XMCD): From Polarized X-Ray Absorption and Sum Rules to Element-Specific Magnetism, Ultrafast Spin Dynamics and Magnetic Imaging
4–6 minutes -
How to Learn de Boor’s Algorithm: B-Spline Evaluation, Knot Spans, Local Support and Numerically Stable Curve Computation
7–11 minutes -
How to Learn the Matula–Beck Algorithm: Smallest-Last Ordering, Graph Degeneracy, k-Cores and Greedy Coloring
7–11 minutes -
How to Learn Patience Sorting: Piles, Binary Search, Longest Increasing Subsequences and O(n log n) Reconstruction
7–10 minutes -
How to Learn the Dutch National Flag Algorithm: Three-Way Partitioning, Loop Invariants, Duplicate Keys and Production Quicksort
6–10 minutes -
How to Learn Dynamic Time Warping (DTW): Cost Matrices, Warping Paths, Step Constraints, Sakoe–Chiba Bands and Production Sequence Alignment
11–17 minutes -
How to Learn the Two-Way String-Matching Algorithm: Critical Factorization, Periods, Maximal Suffixes, Constant Space and Linear-Time Search
10–16 minutes -
How to Learn Elias–Fano Encoding: Monotone Integer Sequences, High/Low Bit Splitting, Unary Gaps, Select and Succinct Search
9–14 minutes -
How to Learn Tarjan’s Low-Link Algorithm: DFS Discovery Times, Bridges, Articulation Points and Biconnected Structure
11–16 minutes -
How to Learn Eytzinger Search Layout: Breadth-First Binary Trees, Index Arithmetic, Branch Prediction, Prefetching and Cache-Aware Search
9–14 minutes -
How to Learn de Casteljau’s Algorithm: Linear Interpolation, Bézier Evaluation, Subdivision, Tangents and Robust Curve Geometry
9–13 minutes -
How to Learn Bitap (Shift-Or): Pattern Bitmasks, Word-Level Automata, Exact Matching and Approximate Search
9–14 minutes -
How to Learn Delta-Stepping: Distance Buckets, Light and Heavy Edges, Relaxation Rounds and Parallel Shortest Paths
10–15 minutes -
How to Learn Raft Consensus: Terms, Elections, Replicated Logs, Commit Rules and Production Distributed Systems
10–15 minutes -
How to Learn the Thomas Algorithm: Tridiagonal Systems, Forward Elimination, Back Substitution and Numerical Stability
6–9 minutes -
How to Learn Booth’s Algorithm: String Rotations, Failure Functions, Candidate Elimination and Linear-Time Lexicographic Minimisation
6–9 minutes -
How to Learn Flood Fill: Grid Neighbours, BFS/DFS Frontiers, Connectivity, Stack Safety and Production Image Filling
7–10 minutes -
Dykstra’s Projection Algorithm | Convex Optimization Learning Guide
7–11 minutes -
How to Learn Karmarkar–Karp Differencing: Number Partitioning, Largest-Difference Heuristics, Priority Queues and Anytime Search
7–11 minutes -
How to Learn Knuth–Bendix Completion: Rewrite Rules, Term Orders, Critical Pairs, Confluence and Equational Reasoning
7–11 minutes -
How to Learn the Moser–Tardos Resampling Algorithm: Bad Events, Dependency Graphs, Witness Trees and Constructive Lovász Local Lemma
9–13 minutes -
How to Learn Pyrenoids and Algal Carbon-Concentrating Mechanisms: From Rubisco Condensation to CO₂ Delivery and Crop Engineering
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.
