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      1 
      2 grammar t058rewriteAST72;
      3 options {language=JavaScript;output=AST;}
      4 a : ID+ -> ID ID ID ; // only 2 input IDs
      5 op : '+'|'-' ;
      6 ID : 'a'..'z'+ ;
      7 INT : '0'..'9'+;
      8 WS : (' '|'\n') {$channel=HIDDEN;} ;