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

2??????

3?????6???

4???????

5??????????

????1????????????????????????27???????????? ??????????27??????????

??????,???????????????,???????????????,?????????????????????????????,????????????????????????,??????????????????,??,????????????????,????????????????????,?????????,?????,??????????,????,???????,????

????,?????????,???????????,???????,????75?????????????,????????????(???????)

?????:?????