Solution2.html

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Revision as of 16:41, 22 August 2012 by Pronate (talk | contribs) (New page: <haskell> parent :: Sheep -> Maybe Sheep parent s = father s `mplus` mother s grandparent :: Sheep -> Maybe Sheep grandparent s = paternalGrandfather s `mplus` paternalGr...)
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parent :: Sheep -> Maybe Sheep
parent s = father s `mplus` mother s

grandparent :: Sheep -> Maybe Sheep
grandparent s = paternalGrandfather s `mplus` 
                paternalGrandmother s `mplus` 
                maternalGrandfather s `mplus` 
                maternalGrandmother s
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