????:1?????????:???????????

2??????????

3????????????

4?????????

5???????????

12?21?,????????,???????????????????,?????????????????????? ????? ? 12????????????21???,?,??????????????,???????????????? ??? ? 12????????????21?,????????,??????,????? ????????? ??? 12????????21???????,?????????,???????????????,??????????????? ???????? ? 12?21?????????????,?,???????,?????????????? ????????????? ????? ??????:????