def passage=(passage)
      sentences = passage.split(SENTENCE_DELIMITER).select { |sentence| sentence.chomp != '' }
      sentences.each { |sentence| self.sentence = sentence }
      add_weight :count, :sentence, sentences.count
    end
def passage=(passage)
      sentences = passage.split(SENTENCE_DELIMITER).select { |sentence| sentence.chomp != '' }
      sentences.each { |sentence| self.sentence = sentence }
      add_weight :count, :sentence, sentences.count
    end
Analyze passage

 Splits passage with sentence-ending punctuation, adds sentence count weight and analyzes each sentence

 @param [String] passage