(Statements
  (Match
    (Send
      (Identifier))
    (Statements
    {+(Pattern
      {+(Statements
        {+(Send
          {+(Identifier)+})+})+}
      {+(Statements)+})+}
      (Pattern
        (Statements
          (Send
            (Identifier))
        {+(Send
          {+(Identifier)+})+})
        (Statements
          (Send
            (Identifier))))
    {+(Statements)+}
    {-(Pattern
      {-(Statements
        {-(Send
          {-(Identifier)-})-})-}
      {-(Statements)-})-}
    {-(Pattern
      {-(Statements
        {-(Send
          {-(Identifier)-})-})-}
      {-(Statements)-})-}
    {-(Send
      {-(Identifier)-})-})))