code: def realpred(cls, lemma, pos, sense=None):
          
          string_tokens = [lemma]
          if pos is not None:
              string_tokens.append(pos)
          if sense is not None:
              sense = str(sense)
              string_tokens.append(sense)
          predstr = '_'.join([''] + string_tokens + ['rel'])
          return cls(Pred.REALPRED, lemma, pos, sense, predstr)
docs: Instantiate a Pred from its components.