?

???????????????????
??????@??????@???????@?????@??????????????????@????????????????????????
??????????????????????
??????????????????????????????????????????????????@????????
------------
(??? )

?

?

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

?? ,?????? ,???? ,???? ,??@? ,?? ,???????

? ,??? ,??? ,?????? ,??????? ;?????? ,???????? ,??a?

??

?? :?????? ,? 1 , ,? 3???????? ,?? ,? 1 ,? 3

? :?????? ,? ,?? 1 ,????? 2

? :1??????15? 2??? ,??? ,? 15? 3?? , 15? 4??? ,??? ,?? 30? 5?????? ,? ...