(Program
  (Comprehension
    (Identifier)
    (
      (
        (
          (Identifier))
        (Identifier))
      (
        (Call
          (Identifier)
          (Empty)))
      (
        (
          (Identifier))
        (Identifier))
      (
        (Call
          (Identifier)
          (Empty)))))
  (Comprehension
    (Plus
      (Identifier)
      (Integer))
    (
      (
        (
          (Identifier))
        (Identifier)))))