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

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

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