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%{
#include <stdio.h>
#include <stdlib.h>
int yyerror(char *);
%}

%token A B
%start S

%%

S: C B
 |
 ;
C: A C
 | A A A A
 ;
%%

int main() {
    yyparse();
    printf("valid string");
}

int yyerror(char *s) {
    printf("error: %s", s);
    exit(0);
}