????????????? ????????

??????????2????????7?? ???????,?????(2??6?),???????,?????????????????????????6~8??,??9~13??????;???????????????????????????????????????????????????????8??????8?????,???????????6~8???,??12~16????????,??

??(7??????8??????),?????????,????????????????6~8??,?????????????10??????????;????4~6?,??????????????8~10?,???????????????10????????

??????????,7????,???5~6????????????7~8?,??,?????????????????????????????????????9~10???????????;??????????????????????????????????????????????9???????10~11?????8??,?????,???????

???

7??,?????,???????????????????????????????

????????????,7????8???????????,????????????,??????????????????????????;?????????????????????,?????7??,????

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