(Program
  (ExpressionStatements
  {+(Assignment
      (Identifier)
      (Object
        (Pair
          (Identifier)
          (CommaOperator
            (NumberLiteral)
            (MathOperator
              (NumberLiteral)
              (Other "+")
              (NumberLiteral))
            (NumberLiteral)))))+}
  {-(CommaOperator
      (Assignment
        (Identifier)
        (NumberLiteral))
      (Assignment
        (Identifier)
        (NumberLiteral)))-}))