You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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a, b, c, d
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1,1,2,2
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1,2,2,2
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1,2,1,4
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4,2,1,4
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2,1,2,4
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1,2,1,4
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1,2,3,3
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3,2,1,2
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2,1,2,2
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1,3,3,1
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1,4,2,2
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1,2,2,2
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1,2,3,4
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4,2,1,4
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2,1,3,4
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1,3,3,4
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1,2,3,3
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3,2,1,2
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2,4,2,2
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1,1,2,1
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3,3,3,3
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1,2,3,1
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4,3,2,1
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3,2,4,1
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2,2,3,3
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4,4,2,1
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