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(1)
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(2)
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— ( )
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— 6 4 2
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6 4 |
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2
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(20 —30 ) |
4 — 5 — 8 — 10
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40
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450 100 100
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8 — |
10
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(430
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( 165 |
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26 — 30 |
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500 — 1000 5 —15
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(2) —
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