Created
March 14, 2016 16:19
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| xx :: [a] -> [a] -> [[a]] | |
| [] `xx` xs = [] | |
| xs `xx` [] = [] | |
| (a:as) `xx` bs = (a `x` bs) ++ (as `xx` bs) | |
| x :: a -> [a] -> [[a]] | |
| a `x` [] = [] | |
| a `x` (b:bs) = [[a,b]] ++ (a `x` bs) |
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