, ...
, . ...
. , ...
( ) – , ...
. , , . 2-3 , , . . (1 . .) , . , , , . , , . , . , , . . : - 1 - 90 () - 1 () - 1/2 . - 70 . : - 2 . - 3 - 3 - 60 - 2 . - 2 . . , () .
http://zhadanov.blogspot.com/2012/04/blog-post_18.html#more