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README.md

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+---
+license: cc-by-4.0
+language:
+- en
+tags:
+- combinatorial-reasoning
+- constraint-satisfaction
+- benchmark
+- llm-evaluation
+size_categories:
+- n<1K
+configs:
+- config_name: default
+  data_files:
+  - split: test
+    path: problems.jsonl
+---
+
+# MathConstraint-Easy
+
+A 266-instance benchmark of natural-language combinatorial constraint-satisfaction problems with solver-verified ground truth. 25 problem types drawn from constraint programming (PyCSP3) and SAT-modulo-symmetries on graphs (pysms). 206 SAT / 60 UNSAT; SAT instances split 103 / 103 into hinted and unhinted. A harder companion split is at [MathConstraint](https://huggingface.co/datasets/MathConstraint/MathConstraint).
+
+## Files
+
+- `problems.jsonl` — canonical data file; one JSON record per line
+- `instances/<name>.json` — same data, one file per instance
+- `manifest.json` — schema, type / SAT / wall-time stats, generation provenance
+- `_raw/<name>.{xml,cnf}` — solver model file (XCSP3 for pycsp problems, CNF DIMACS for pysms graph problems)
+- `_raw/<name>.out.json` — solver stdout / stderr / command for the reference verdict
+
+The `_raw/` files let any external SAT/CSP solver independently verify the labels.
+
+## License
+
+CC-BY-4.0
+
+## Citation
+
+Anonymous. Citation provided in camera-ready.