, 60- XX . , , .
, . " " [14, 9, 2830]. , " " [13, 5, 15]. " " , , , , [14, 13, 20, 24, 30, 31]. - , ( ) ( ), , , , , , () [1-9, 11, 13, 15, 1720, 23, 24, 29, 30]. , , , [1-9, 11, 13, 15, 17, 20, 23, 24, 29-31].
. 80% , , , , , , [19, 11,13, 15, 17, 20, 21, 23, 24, 2931]. , , , [1,3, 2631].
, , . , , , , . , - [2, 22]
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