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... (2)=2
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h h h
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: 0
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0
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h h h
h
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h h hf x h f x
c c f xh
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: 0 0
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0 0
0 0 0
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h h
h h h
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f x g x
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= +
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. , ... ( ) ( ) ( )P A B P A P B = +
, A B = () = () + ()
: ( ) ( ) ( ) ( ) ( )( ) ( ) ( )( ) ( ) ( ) ( )
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= = = + = +
... () = 1- ()
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: ( ) ( ) ( ) ( )N A B N A N B N A B = + ()+() A B , :
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N N N N N +
= = = + = +
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. () () .
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