(Program
{+(Assignment
    (
      (Identifier)
      (Identifier))
    (
      (Integer)
      (Integer)))+}
  (Assignment
  { (Identifier)
  ->(Identifier) }
    (Integer))
  (Assignment
  { (
      (Identifier)
      (Identifier))
  ->(Identifier) }
    (
      (Integer)
      (Integer)))
{-(Assignment
    (Identifier)
    (
      (Integer)
      (Integer)))-})