??? ??? ???????? ?????? ??????? ??? ???? ??????? ?? ?????? {??????. .?? ??????? {???????{ ?? ??????? ? ????????? ????? ?????? ??? ???? ?????? ?????? ????? ??? ???? ?????? ??????? ??? ??????? ????????. ???? ??? ??????: * ???? ??? 19 ????. * ??????? ??? ????? ???? ??? ?????. * ????? ???????? ???????. ?????? ???? ???? ?????? ?????? ????? ???? ?