[ { "min_n": 10, "max_n": 30, "max_val": 50, "ensure_solvable": true }, { "min_n": 5, "max_n": 20, "max_val": 50, "ensure_solvable": true }, { "min_n": 5, "max_n": 20, "max_val": 20, "ensure_solvable": true }, { "min_n": 5, "max_n": 25, "max_val": 30, "ensure_solvable": true } ]