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isIsogram :: String -> Bool
isIsogram = all ((1==) . length) . group . sort . filter isLetter . map toLower
isIsogram :: String -> Bool
isIsogram = map toLower . filter isLetter . sort . group . all (length . (==1))
const person = { firstName: "Cedd", lastName: "Burge" };
return converge(compliment, [firstName, lastName])(person);