extern enum relations relations_with(natid, natid);
extern char *relations_string(enum relations);
extern int nat_accepts(natid, natid, enum rej_comm);
extern int in_contact(natid, natid);
extern void agecontact(struct natstr *np);
extern int influx(struct natstr *np);
extern enum relations relations_with(natid, natid);
extern char *relations_string(enum relations);
extern int nat_accepts(natid, natid, enum rej_comm);
extern int in_contact(natid, natid);
extern void agecontact(struct natstr *np);
extern int influx(struct natstr *np);