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Solution2.html

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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

Alternative grandparent: 

grandparent :: Sheep -> Maybe Sheep
grandparent s = (father s >>= parent) `mplus` (mother s >>= parent)
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