sentence1: a sentiment lexicon is a list of words and phrases , such as “ excellent ” , “ awful ” and “ not bad ” , each of them is assigned with a positive or negative score reflecting its sentiment polarity and strength ( cite-p-18-3-8 ) .
sentence2: a sentiment lexicon is a list of words and phrases , such as excellent , awful and not bad , each is being assigned with a positive or negative score reflecting its sentiment polarity .