???????????
???????????????????????
????????????????????
??????????????????????????????
1/2
1/2
1/2
1/4
1/4
1/3
1/3
1/3
1/3
2/3
1/4
1/4
1/4
1/4
1/5
1/5
1/5
1/5
1/5
2/5
1/5
1/5
1/5
3/5
1/5
1/5
4/5
1/5