[ { "min_n": 1, "max_n": 100, "solvable_probability": 0.5 }, { "min_n": 1, "max_n": 50, "solvable_probability": 0.6 }, { "min_n": 5, "max_n": 50, "solvable_probability": 0.7 }, { "min_n": 20, "max_n": 100, "solvable_probability": 0.3 } ]