int i4mat_sum ( int m, int n, int a[] );
int *polyomino_embed_list ( int mr, int nr, int r[], int mp, int np, int p[], 
  int number );
int polyomino_embed_number ( int mr, int nr, int r[], int mp, int np, int p[] );
void polyomino_print ( int m, int n, int p[], char *label );
void timestamp ( );