Removes common stopwords ("the", "a", "of", ...) from a string, keeping the
DeleteStopwords[list]
DeleteStopwords["string"]
DeleteStopwords[{"string1", "string2", …}]
DeleteStopwords["A long time ago, in a galaxy far, far away"]
→ long time ago, galaxy far, far awayDeleteStopwords[{"a", "list", "of", "words"}]
→ {list, words}DeleteStopwords[WordCounts["the cat sat on the mat"]]
→ <|mat -> 1, sat -> 1, cat -> 1|>