input: Write a python function to check if all elements of one list are in another list.
  assert check_equality([1, 2, 3], [2, 3, 4]) == False
  assert check_equality([1, 2, 3], [1, 2, 3, 4]) == True
  assert check_equality([1, 2, 3], [1, 2, 3]) == True
output: def check_equality(list1, list2):
      return all(elem in list2 for elem in list1)