Created
December 7, 2011 07:24
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list lifting
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| plus :: [Int] -> [Int] -> [Int] | |
| plus = liftM2 (+) | |
| -- plus [1,2,3] [3,6,9] ---> [4,7,10, 5,8,11, 6,9,12] | |
| -- plus [1..] [] ---> _|_ (i.e., keeps on calculating forever) | |
| -- plus [] [1..] ---> [] |
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