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SubMiner/backlog/tasks/task-59 - Restrict-Yomitan-frequency-lookup-to-selected-headword-only.md

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---
id: TASK-59
title: Restrict Yomitan frequency lookup to selected headword only
status: Done
assignee: []
created_date: '2026-02-16 22:16'
updated_date: '2026-02-18 04:11'
labels: []
dependencies: []
ordinal: 26000
---
## Description
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Update tokenizer and related scripts/tests so frequency lookup no longer uses Yomitan headword variant lists and instead only uses the selected headword returned by Yomitan.
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## Acceptance Criteria
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- [x] #1 Frequency ranking for Yomitan tokens uses only the token headword (with existing fallback behavior) and not `frequencyLookupTerms` variants.
- [x] #2 Tokenizer tests reflect the new headword-only lookup behavior.
- [x] #3 Parser testing script output no longer implies variant-based frequency lookup.
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## Final Summary
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Updated frequency lookup to use only the selected token lookup text (headword first, fallback to reading/surface only when headword is absent) and removed Yomitan variant-term usage. Removed `frequencyLookupTerms` from token mapping/types, updated tokenizer tests for headword-only behavior, and aligned helper scripts (`scripts/get_frequency.ts`, `scripts/test-yomitan-parser.ts`) so diagnostics/output no longer imply variant-based lookup.
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