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28
A
A
1
3
a
b
a
b
2
( )
27−31,
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):
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;
2.
;
3. .
20 .
"B"
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(. 1).
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K
.
1.
(.2a);
2. −
(.2b).
:
(.3).
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.
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"B"
29
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24
2 30 5
.
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.
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.
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).
K
(stop)
.
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,
.
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