[ { "min_n": 5, "max_n": 15, "min_s": 1, "max_s": 20, "min_l": 2, "max_l": 5, "ensure_solvable": false }, { "min_n": 10, "max_n": 25, "min_s": 5, "max_s": 30, "min_l": 4, "max_l": 10, "ensure_solvable": false }, { "min_n": 3, "max_n": 10, "min_s": 0, "max_s": 10, "min_l": 1, "max_l": 3, "ensure_solvable": false }, { "min_n": 10, "max_n": 20, "min_s": 5, "max_s": 30, "min_l": 3, "max_l": 7, "ensure_solvable": false } ]