@curious_reader let happy = ((||) <$> (==1) <*> ((&&) <$> (/=4) <*> happy)) . sum . map (join (*) . digitToInt) . show
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@curious_reader let happy = ((||) <$> (==1) <*> ((&&) <$> (/=4) <*> happy)) . sum . map (join (*) . digitToInt) . show