Bison cambiar-reducir conflicto - No se puede resolver

La gramática es la siguiente:

1. program -> declaration-list
2. declaration-list -> declaration-list declaration | declaration
3. declaration -> var-declaration | fun-declaration
4. var-declaration -> type-specifier ID ; | type-specifier ID [ NUM ] ;
5. type-specifier -> int | void
6. fun-declaration -> type-specifier ID ( params ) compound-stmt
7. params -> param-list | void
8. param-list -> param-list , param | param
9. param -> type-specifier ID | type-specifier ID [ ]
10. compound-stmt -> { local-declarations statement-list }
11. local-declarations -> local-declarations var-declarations | empty
12. statement-list -> statement-list statement | empty
13. statement -> expression-stmt | compound-stmt | selection-stmt |
iteration-stmt | return-stmt
14. expression-stmt -> expression ; | ;
15. selection-stmt -> if ( expression ) statement |
if ( expression ) statement else statement
16. iteration-stmt -> while ( expression ) statement
17. return-stmt -> return ; | return expression ;
18. expression -> var = expression | simple-expression
19. var -> ID | ID [ expression ]
20. simple-expression -> additive-expression relop additive-expression |
additive-expression
21. relop -> <= | < | > | >= | == | !=
22. additive-expression -> additive-expression addop term | term
23. addop -> + | -
24. term -> term mulop factor | factor
25. mulop -> * | /
26. factor -> ( expression ) | var | call | NUM
27. call -> ID ( args )
28. args -> arg-list | empty
29. arg-list -> arg-list , expression | expression

El cambio reduce el conflicto que obtengo a través de bison -d -v xyz.l en el estado 97

state 97

   29 selection-stmt: IF LFT_BRKT expression RGT_BRKT statement .
   30               | IF LFT_BRKT expression RGT_BRKT statement . ELSE statement

    ELSE  shift, and go to state 100

    ELSE      [reduce using rule 29 (selection-stmt)]
    $default  reduce using rule 29 (selection-stmt)

Pero no sé cómo resolver este conflicto. Esperando una respuesta.

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