struct cellulare {
  const char *caratteri[9];
};

extern struct cellulare *construct(const char *uno,
				   const char *due,
				   const char *tre,
				   const char *quattro,
				   const char *cinque,
				   const char *sei,
				   const char *sette,
				   const char *otto,
				   const char *nove);
extern char *toString(struct cellulare *this);
extern char *t9(struct cellulare *this, const char *s);