?? ?????????????
????:1????????:???????????
2???????
3???????
4???????
5??????????
??????????:
??,?????????????????2??4??8????????????????
?????????:??????????????:
??,?????????????????2??4??8????????????????
?????????:????????:1????????:???????????
2???????
3???????
4???????
5??????????
??????????:
??,?????????????????2??4??8????????????????
?????????:????