In this task, you are given a list. This list contains many lists of integers. The list is several items written within a []. Your task is to find the maximum number among the members of each inner list. The output should be a list comprised of the maximums with the same order as the internal lists.
[[13, -2, 11, -187, -119, -20], [-91, -59, -64], [1, 42, -34, 71, 8, -3], [-34, -133, -171, -66]]