input: Write a Python function to combine two lists into a dictionary.
  assert combine_lists_to_dict([1, 2, 3], ['a', 'b', 'c']) == {1: 'a', 2: 'b', 3: 'c'}
  assert combine_lists_to_dict([4, 5, 6], ['d', 'e', 'f']) == {4: 'd', 5: 'e', 6: 'f'}
  assert combine_lists_to_dict([7, 8, 9], ['g', 'h', 'i']) == {7: 'g', 8: 'h', 9: 'i'}
output: def combine_lists_to_dict(list1, list2):
      return dict(zip(list1, list2))