[ { "min_n": 1, "max_n": 5, "solvable": true, "max_attempts": 500 }, { "min_n": 5, "max_n": 15, "solvable": false, "max_attempts": 2000 }, { "min_n": 3, "max_n": 10, "solvable": null, "max_attempts": 1000 }, { "min_n": 4, "max_n": 12, "solvable": false, "max_attempts": 1200 }, { "min_n": 2, "max_n": 8, "solvable": null, "max_attempts": 750 }, { "min_n": 6, "max_n": 14, "solvable": true, "max_attempts": 1800 } ]