This module contains helper functions for using in various interpretation classes for Pavel's interpretation modules
list_1 = ["1", 2, 3, 4, "5", 77, -7]
list_2 = [3, "5"]
list_3 = [4, -7]
list_4 = ["bla-bla", 0, 77]
list_diff(list_1, list_2, list_3, list_4)
test_eq(list_diff(list_1, list_2, list_3, list_4), ['1', 2])
which_elms(list_1, list_2)
which_elms(list_1, list_4)
test_eq(which_elms(list_1, list_2), [3, '5'])
test_eq(which_elms(list_1, list_4), [77])