text: assert [(x,y) for x in range(1,3) for y in range(5) if x < y] == \
      [(1, 2), (1, 3), (1, 4), (2, 3), (2, 4)]
  assert {x**2 for x in range(5) if x % 2 == 0} == \
      {0, 16, 4}
  assert {k: len(k) for k in ("red", "green", "blue")} == \
      {'red': 3, 'green': 5, 'blue': 4}
  