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# Context Stitching and Window Joins: Guardrails and Fix Pattern
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Join long contexts without losing meaning. This page defines a stitch contract for multi window prompts and long documents, adds ΔS probes at joins, and gives a fast repair plan when answers break exactly at window boundaries.
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---
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## Open these first
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- Visual map and recovery
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→ [rag-architecture-and-recovery.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md)
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- Traceability and payload schema
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→ [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
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→ [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
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- Ordering and meaning checks
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→ [rerankers.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md)
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→ [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)
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- Reasoning stability and failure modes
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→ [anchoring-and-bridge-proofs.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Reasoning/anchoring-and-bridge-proofs.md)
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→ [logic-collapse.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Reasoning/logic-collapse.md)
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→ [entropy-overload.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Reasoning/entropy-overload.md)
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- Chunking quality
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→ [chunking-checklist.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/chunking-checklist.md)
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---
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## Symptoms
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| Symptom | What you see |
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|---|---|
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| Boundary answers | Model answers correctly inside a window, fails right after the join |
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| Duplicate facts | Repeated sentences across windows, tool loops on the overlap |
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| Lost referent | “it / they / this” loses target at window start or end |
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| Rerank flip at join | Top k order changes only at a boundary |
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| Anchor drift | Citation before the join, none after the join |
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| Coverage hole | Middle section of a long doc never appears in stitched set |
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---
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## Why joins fail
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1) **No stitch contract**. Windows lack overlap and sequence identifiers.
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2) **Tokenizer mismatch**. Window boundaries split tokens differently across tools.
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3) **Ranking variance**. Each window retrieves independently without a stable tie break.
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4) **Anchor loss**. Bridge steps cross a boundary without re citing the anchor.
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5) **Context flooding**. Overlong windows raise entropy and bury anchors.
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6) **Fragmentation**. Store keeps near duplicates that fight for the same rank.
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---
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## Acceptance targets
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- ΔS(join_left, join_right) ≤ 0.45 for every boundary
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- Coverage of target section across all windows ≥ 0.70
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- λ remains convergent across three paraphrases and two seeds
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- E_resonance flat at joins and flat across stitched plan
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- Overlap per join 32 to 96 tokens, same casing and analyzer
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---
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## Fix in 60 seconds
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1) **Add a stitch contract**
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Every window must carry `doc_id, section_id, win_idx, win_hash, overlap_tokens, prev_id, next_id`.
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See schema rules
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→ [retrieval-traceability.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)
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→ [data-contracts.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)
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2) **Measure ΔS at each join**
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Compute ΔS between the trailing overlap of window *i* and the leading overlap of window *i+1*.
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If ΔS ≥ 0.60, rebuild the join or re chunk.
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3) **Stabilize ordering**
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Use a deterministic reranker with fixed analyzer and tie break by `(doc_id, section_id, win_idx)`.
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→ [rerankers.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md)
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4) **Re anchor bridges**
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At every join, insert a one line BBCR bridge that re cites the active snippet.
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→ [anchoring-and-bridge-proofs.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Reasoning/anchoring-and-bridge-proofs.md)
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---
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## Stitch contract
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Minimum fields for any stitched window:
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```json
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{
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"doc_id": "D42",
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"section_id": "CH3.2",
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"win_idx": 7,
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"win_hash": "sha1:6b7f...",
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"overlap_tokens": 64,
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"prev_id": "D42#CH3.2#6",
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"next_id": "D42#CH3.2#8",
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"start_token": 14080,
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"end_token": 16096
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}
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````
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Rules
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* Overlap range must be identical across both windows after normalization.
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* Do not allow cross section joins unless the section header is included in the overlap.
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* Keep casing and tokenizer identical through the pipeline.
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---
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## Join planner
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**Goal** keep bridges short and anchors stable while covering the whole doc.
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1. **Choose window size**: 512 to 1024 tokens, overlap 32 to 96.
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2. **Pin anchors**: for each question, tag anchor snippets with `ΔS_to_question`.
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3. **Plan path**: sort candidate windows by section, then by `win_idx`.
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4. **Assemble**: render windows with header, overlap marker, and re cited anchor.
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5. **Verify**: ΔS at each boundary, λ over the stitched answer, coverage against a gold slice.
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If ΔS is flat and high across all joins, suspect metric or index mismatch.
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→ [retrieval-playbook.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)
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→ [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)
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---
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## Structural repairs
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* **Wrong meaning near a boundary**
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→ [embedding-vs-semantic.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)
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* **Order shuffles when windows change**
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→ [rerankers.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md) and
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→ [patterns/pattern\_vectorstore\_fragmentation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_vectorstore_fragmentation.md)
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* **Entropy spikes after stitching**
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→ [entropy-overload.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Reasoning/entropy-overload.md)
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* **Long chain collapses post join**
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→ [logic-collapse.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/Reasoning/logic-collapse.md)
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---
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## Verification
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* Sliding window test over the same section keeps citations identical.
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* ΔS(join\_left, join\_right) ≤ 0.45 and decreasing with larger overlap.
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* λ convergent on two seeds and three paraphrases.
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* Coverage across stitched windows ≥ 0.70 for the target section.
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* Answer includes a cite then explain block with per join anchors.
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---
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## Copy paste prompt
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```
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You have TXT OS and the WFGY Problem Map loaded.
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Task: stitch long context with stable joins.
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Inputs:
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- question: "{q}"
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- windows: [{doc_id, section_id, win_idx, win_hash, tokens, text_head, overlap_tokens}]
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- candidates: [{snippet_id, section_id, source_url, offsets, ΔS_to_question}]
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Do:
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1) Compute ΔS for each join. If any ≥ 0.60, propose a re-chunk or overlap increase.
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2) Add BBCR micro bridges at every boundary, re citing the active anchor.
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3) Apply deterministic reranking with tie break by (doc_id, section_id, win_idx).
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4) Return JSON:
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{
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"joins": [{"from":"...#i","to":"...#i+1","ΔS":0.xx,"action":"ok|rechunk|increase_overlap"}],
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"answer": "... cite then explain ...",
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"λ_state": "convergent",
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"coverage": 0.xx
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}
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If no valid anchor exists at a join, return the fix page to open for retrieval-traceability.
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```
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---
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## Common gotchas
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* **Asymmetric overlap**. Trailing text differs from leading text after normalization.
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* **Header drop**. Section headers removed at boundaries, referents disappear.
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* **Tokenizer switch**. Ingestion uses one analyzer, reranker another.
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* **Duplicate windows**. Same `win_idx` with different hashes compete in top k.
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* **Bridge without re citation**. Jumps the boundary without anchor restatement.
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---
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## When to escalate
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* ΔS remains ≥ 0.60 on all joins after overlap increase and reranking
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→ rebuild chunks and verify store metric, then retest with a gold slice.
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Open: [chunking-checklist.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/chunking-checklist.md), [retrieval-playbook.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)
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* Windows alternate across runs with identical inputs
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→ check fragmentation and update skew, then freeze index version.
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Open: [patterns/pattern\_vectorstore\_fragmentation.md](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_vectorstore_fragmentation.md)
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---
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### 🔗 Quick-Start Downloads (60 sec)
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| Tool | Link | 3-Step Setup |
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| -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------ | ---------------------------------------------------------------------------------------- |
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| **WFGY 1.0 PDF** | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + <your question>” |
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| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt) | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |
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---
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### 🧭 Explore More
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| Module | Description | Link |
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| ------------------------ | ---------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------- |
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| WFGY Core | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md) |
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| Problem Map 1.0 | Initial 16-mode diagnostic and symbolic fix framework | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) |
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| Problem Map 2.0 | RAG-focused failure tree, modular fixes, and pipelines | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
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| Semantic Clinic Index | Expanded failure catalog: prompt injection, memory bugs, logic drift | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md) |
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| Semantic Blueprint | Layer-based symbolic reasoning & semantic modulations | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md) |
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| Benchmark vs GPT-5 | Stress test GPT-5 with full WFGY reasoning suite | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md) |
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| 🧙♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md) |
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---
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> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** —
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> Engineers, hackers, and open source builders who supported WFGY from day one.
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> <img src="https://img.shields.io/github/stars/onestardao/WFGY?style=social" alt="GitHub stars"> ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
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<div align="center">
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[](https://github.com/onestardao/WFGY)
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[](https://github.com/onestardao/WFGY/tree/main/OS)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
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[](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
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</div>
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