def n_plus(places, word_list)
      analysis = Analysis.new(self, :nouns => word_list)
      substitutor = Substitutor.new(analysis)
      substitutor.replace(:nouns).increment(places)
    end
def n_plus(places, word_list)
      analysis = Analysis.new(self, :nouns => word_list)
      substitutor = Substitutor.new(analysis)
      substitutor.replace(:nouns).increment(places)
    end
Replace the words in the word list with the word n places after it