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

2??????????

3?????????

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

5??????????

6???20?????????????,?,?????????????????????20?,6?????????????????9?????????????18??,???????????? ????????????? 6?????????????20???,??????,?????20?,6?9?????????????????18??,????? ????????? 6?20???,??????,???20?,6?9?18?????????????,?????????? ?? ??????????:??????????????