code: def keywords(limit = 20)
        @keywords ||= {}
        @keywords[limit] ||= begin
          list = []
          count = 0
          _stopwords = Vidibus::Words.stopwords(*locales)
          for word in sort
            clean = word.permalink.gsub('-','')
            unless _stopwords.include?(clean)
              list << word
              count += 1
              break if count >= limit
            end
          end
          list
        end
      end
docs: Returns top keywords from input string.