extern void speak(const char*, ...);
extern void sspeak(int msg, ...);
extern void pspeak(vocab_t, enum speaktype, bool, int, ...);
extern void rspeak(vocab_t, ...);
extern void echo_input(FILE*, const char*, const char*);
extern void speak(const char*, ...);
extern void sspeak(int msg, ...);
extern void pspeak(vocab_t, enum speaktype, bool, int, ...);
extern void rspeak(vocab_t, ...);
extern void echo_input(FILE*, const char*, const char*);