(Program
  {-(OperatorAssignment
    (Identifier)
    (IntegerLiteral))-}
  (OperatorAssignment
    (Identifier)
    (IntegerLiteral))
  (OperatorAssignment
    (Identifier)
    (IntegerLiteral))
  (OperatorAssignment
    (Identifier)
    (IntegerLiteral))
  (OperatorAssignment
    (Identifier)
    (IntegerLiteral))
  {+(OperatorAssignment
    (Identifier)
    (IntegerLiteral))+})