I don't know ???

problem_set = {2, 4, 7}
support_set = {6, 5, 2}

new_problem_list = list()
new_support_list = list()

for a, b in zip(list(problem_set), list(support_set)):
    print('compare:', a, 'with', b)

    new_problem_list.append( min(a, b) )
    new_support_list.append( max(a, b) )

print(new_problem_list, new_support_list)