(Program
  (ExpressionStatements
    (MathOperator
      (MathOperator
        (Identifier)
        (Other "+")
        (MathOperator
          (Identifier)
          (Other "*")
        { (NumberLiteral)
        ->(NumberLiteral) }))
      (Other "-")
      (MathOperator
        (Identifier)
        (Other "%")
      { (NumberLiteral)
      ->(NumberLiteral) }))))