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