?? ????4??? ???????????
????:1???????:????????
2?????????
3?????????
4???????????
5?????
??12???6?? ???5??:12??5????????????????????????15????28??????????????????,???????????,?????????,?????,?,??,?4????????????????????????????????,????1????????????,?????;3???,????????????1?????????,???????????2????????????????????????????????????
???,???,??????????,??????,?????????????,?,????????????????
????? ??????????:???????????