def find_missing_numbers(nums):   """   Finds all the missing numbers in a list of integers.    Args:     nums: A list of integers.    Returns:     A list of all the missing numbers in the list.   """    # Create a set of all the numbers in the list.   num_set = set(nums)    # Create a list of all the numbers from 1 to the maximum number in the list.   max_num = max(nums)   num_list = list(range(1, max_num + 1))    # Find the missing numbers by subtracting the set of numbers in the list from   # the list of all numbers.   missing_nums = list(set(num_list) - num_set)    return missing_nums