unbreak singleton?
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a6d0c33a94
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c27d17e1ec
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@ -59,7 +59,7 @@ IN: sequences.lib
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] { } make ;
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: singleton? ( seq -- ? )
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length 1 = ; foldable
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length 1 = ;
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: delete-random ( seq -- value )
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[ length random ] keep [ nth ] 2keep delete-nth ;
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