{
    "decisions": [
        {
            "candidate_id": "refc_8ffa427c366fbfbe",
            "decision": "reject",
            "reason_codes": [
                "coincidental_overlap",
                "role_conflict"
            ],
            "grounds": [
                "entity_meaning",
                "role_meaning"
            ],
            "cited_evidence_ids": [
                "refm_16465b36e33387e0",
                "keycert_1a0c96d71db2b50e"
            ],
            "claims": [
                {
                    "fact": "distinct_eligible_tuples",
                    "value": 12
                },
                {
                    "fact": "matched_distinct_tuples",
                    "value": 10
                },
                {
                    "fact": "unmatched_distinct_tuples",
                    "value": 2
                }
            ],
            "rationale": "birth_month is a calendar month (1..12), while the parent key is a card identifier numbered from 0. The small-integer overlap is coincidental: a birth month does not name a card."
        }
    ],
    "suggestions": []
}