[ { "a_min_length": 4, "a_max_length": 20, "k_min": 10, "k_max": 1000, "prob_05": 0.3 }, { "a_min_length": 2, "a_max_length": 10, "k_min": 5, "k_max": 500, "prob_05": 0.4 }, { "a_min_length": 2, "a_max_length": 15, "k_min": 5, "k_max": 1000, "prob_05": 0.4 }, { "a_min_length": 1, "a_max_length": 5, "k_min": 1, "k_max": 100, "prob_05": 0.3 } ]