?? ?????????
????:1???????:?????????
2????????
3???????????
4???????
5????????
?????????????12????????????????4????????? (??? ???????)??4??,??????,?????
??????????,?????????????,????????,?????????????????????
?????????,??????,??,????????,???,???????????????????????????????????????
?3???????,??4???1?????????????????,???,??????????????????,?????????,??????????????(??????????????) ???:??????????????????