#define INTSTACKSIZE 64
struct intstack {
  int vals[INTSTACKSIZE];
  unsigned pos;
};

void intstack_init(struct intstack *is);
void intstack_push(struct intstack *, int);
int intstack_pop(struct intstack *);
int intstack_top(const struct intstack *);


struct stringdict;

struct permutation {
  int *v;
  int num;
};

struct permutation *mySort(const struct stringdict *);
void permutation_destroy(struct permutation *);