typedef struct
{
    int  nBits;
    int  nInts;
    int *pInts;
} Vector;

extern Vector *new      (int nBits);
extern void    DESTROY  (Vector *pVector);
extern void    dump     (Vector *pVector);
extern int     top      (Vector *pVector);
extern void    insert   (Vector *pVector, int n);
extern void    Remove   (Vector *pVector, int n);
extern int     member   (Vector *pVector, int n);
extern Vector *Union    (Vector *pA, Vector *pB);
extern Vector *intersect(Vector *pA, Vector *pB);