Write a function that takes in a list of integers and a target sum, and returns a list of all distinct sets of integers from the input list that add up to the target sum. Each set should contain at most one instance of each integer from the input list, and the sets should be sorted in lexicographic order. For example, if the input list is [10, 1, 2, 7, 6, 1, 5] and the target sum is 8, the function should return [[1, 7], [1, 2, 5], [2, 6], [1, 1, 6]].