????:1???????:???????

2?????????

3??????

4???????

5???????

??2?1??????????? (????????????????? ?)?1???????,???2??3????????????????,??????????????,?4????6?,????????????????????6??????8??

?,1??31?,??,????????????????????????????;?????????????????????,???????????????

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

????,2?????????3????????????,??4???6?,??????????????????????6????8?;?4????5???????,??7?8??????????????????????,??6??????????8???????????????????????????????9?????????????????

????????????,??????????????,??????????????,????,????,?????,????????????????(????????????????????) ???:??