18.1. , , , .
18.2. , , , , , , .., , , 3 .
18.3. () , () , .
18.4. .
18.5. , , , ( ), 50%, .
19.1. , .
19.2. .
19.3. , :
;
;
;
;
50% .
19.4. , , , , .
19.5. , .
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20.1. () . ,
20.2. , , , .
21.1. .
21.2. , . .
21.3. , , , .
21.4. , , , , - .
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