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    IV              r;
    SV              *aryref;
    unsigned char   *b;             /* bitstring: array of bytes */
    int             state;          /* state 0 / 1 / 2 */
    int             x;
    int             y;
} COMBINATION;

COMBINATION* init_combination(IV n, IV r, AV *av);
void free_combination(COMBINATION *c);
/* coollex pseudo-coroutine */
bool coollex(COMBINATION *c);
void coollex_visit(COMBINATION *c, SV **p_items);

#endif