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2
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4
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8
9
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12
1.
2.
3.
4.
5.
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1,2,4,7,9
3,4,8,9,10
1,3,4,7,10
1,4,5,6,9
13 " " :
14 " "
15 ,
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= 0
16
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17 - ,
18 ,
19
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20
21 " "
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22
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23 : ( 2 )
24
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25
()
26
27 :
28 :
29 :
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30 , :
