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gfldex/gist:491d637082df050f825f8a7adcd2746c Secret

Created July 28, 2016 11:07
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gistfile1.txt
multi cross(&f, @ ($x, *@xs), @ys) { flat map({&f($x, $_)}, @ys), cross(&f, @xs, @ys); }
multi cross(&f, @ (), @ys) { (); }
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