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

????????2?????13?? ??13???????????????,??,??,???????????????????????????????????????????????6~8???,??10~12???????,????????4~8???,????10??

???????????????,????,?????????????????????????????????4~5??,???????????????4~6??????????????????????6~7???

???,??14????????15??,???????????????????,??????????????,?????????????????????;????????,???????????????????????,???

??????,???????????????????????????,??;???????????,????????,????