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      1 grammar t057autoAST21;
      2 options {language=JavaScript;output=AST;}
      3 a : ID (op^ ID)* ;
      4 op : {pass}'+' | '-' ;
      5 ID : 'a'..'z'+ ;
      6 INT : '0'..'9'+;
      7 WS : (' '|'\n') {$channel=HIDDEN;} ;
      8