The script defines the following function:
processSentence(sentence,posLex,negLex,tagger): The parameters of this function are a sentence (a string), a set of positive words, a set of negative words, and a POS tagger. The function returns a list with all the 4-grams in the sentence that have the following structure:
not any-word pos/neg word(noun)
For example: not a good idea