docs: def word(self, position):
          '''
          Returns the word instance at the given position in the sentence, None if not found.
          '''
          if 0 <= position < len(self.wordlist):
              return self.wordlist[position]
          else:
              log.warn('position "{}" is not in sentence of length "{}"!'.format(position, len(self.wordlist)))
              raise IndexError()