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

2?????????

3?????

4????????????

5?????????

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