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

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

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

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