-- 3. 
wordsFilter = filter (\x -> x /= "a" && x /= "the" && x /= "an") . words
wordsFilter = filter (\x -> x /= "a" && x /= "the" && x /= "an") . words
wordsFilter = filter (\x -> x /= "a" && x /= "the" && x /= "an") . words