extern uschar *string_append_listele(uschar *, uschar, const uschar *);
extern uschar *string_append_listele_n(uschar *, uschar, const uschar *, unsigned);
extern uschar *string_base62(unsigned long int);
extern uschar *string_append_listele(uschar *, uschar, const uschar *);
extern uschar *string_append_listele_n(uschar *, uschar, const uschar *, unsigned);
extern uschar *string_base62(unsigned long int);