DIMACS storage

n75-rct4.cnf (~41 MB) is not in the git tree. The committed record is n75-rct4-audit.json (SHA-256 1709cdf478920fd9ed0160bc5f00e049b10f0f6b28a1955560cd4aaa88205317, 996434 variables, 2398895 clauses).

Regenerate

Needs python-sat. From this folder:

python3 ../search_sat.py --n 75 --write-cnf n75-rct4.cnf --seconds 0.01
python3 ../audit_dimacs.py n75-rct4.cnf --json /tmp/n75-rct4-audit.json

search_sat.py also starts a solver; the --seconds cap is only to exit after the DIMACS write. Compare the audit SHA-256 to n75-rct4-audit.json. run_all.sh audits the CNF only when the file is present locally.

No proof trace was stored for the near-seed UNSAT runs; those JSON files remain residue, not a certified exclusion.