numberString :: Gen String
numberString = (\(NonNegative n) -> show n) <$> (arbitrary :: Gen (NonNegative Int))
numberString :: Gen String
numberString = (\(NonNegative n) -> show n) <$> (arbitrary :: Gen (NonNegative Int))
numberString = (\(NonNegative n) -> show n) <$> (arbitrary :: Gen (NonNegative Int))