. IS , ().
, r1 .
.1 . IS
} 1. , C+I1+G. , , E1 Y1, , r1 Y1. (.1).
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IS , . - IS, . , IS, .
, IS (. .1). () Y1 r2. r2 Y2: , .. . Y1 Y2. , Y1 r2. , , , IS, (). , .
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D IS (. .1). r1 () Y2. Yl Y2. , 2, D, . , , IS , () .
IS , , .
, IS , . , .