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300
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500
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400
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200
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300
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100
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600
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200
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-100
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300
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A---B
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500
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400
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500
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400
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200
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400
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300
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200
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200
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-100
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200
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100
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1000
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-200
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300
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100
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400
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100
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200
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500
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400
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500
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100
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600
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600
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600
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