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- grammar expression;
- stat : expr
- ;
- expr : multExpr (('+'|'-') multExpr)*
- ;
- multExpr: atom ('*' atom)*
- ;
- atom : INT
- | ID
- | '(' expr ')'
- ;
- ID : 'a'..'z'+ ;
- INT : '0'..'9'+ ;
- WS : (' '|'\n')+ {$channel=HIDDEN;} ;
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