docs: def _process_maybe_work(self, yes_work, maybe_work, work_dir,
                              yn_results_path, stats):
          """Returns statistics of how `yes_work` compares with `maybe_work`.
  
          :param yes_work: name of work for which stats are collected
          :type yes_work: `str`
          :param maybe_work: name of work being compared with `yes_work`
          :type maybe_work: `str`
          :param work_dir: directory where generated files are saved
          :type work_dir: `str`
          :param yn_results_path: path to results intersecting
                                  `yes_work` with "no" works
          :type yn_results_path: `str`
          :param stats: data structure to hold statistical data of the
                        comparison
          :type stats: `dict`
          :rtype: `dict`
  
          """
          if maybe_work == yes_work:
              return stats
          self._logger.info(
              'Processing "maybe" work {} against "yes" work {}.'.format(
                  maybe_work, yes_work))
          # Set base values for each statistic of interest, for each
          # witness.
          for siglum in self._corpus.get_sigla(maybe_work):
              witness = (maybe_work, siglum)
              stats[COMMON][witness] = 0
              stats[SHARED][witness] = 0
              stats[UNIQUE][witness] = 100
          works = [yes_work, maybe_work]
          # Sort the works to have a single filename for the
          # intersection each pair of works, whether they are yes or
          # maybe. This saves repeating the intersection with the roles
          # switched, since _run_query will use a found file rather than
          # rerun the query.
          works.sort()
          ym_results_path = os.path.join(
              self._ym_intersects_dir, '{}_intersect_{}.csv'.format(*works))
          stats = self._process_intersection(yes_work, maybe_work, work_dir,
                                             ym_results_path, stats)
          stats = self._process_diff(yes_work, maybe_work, work_dir,
                                     ym_results_path, yn_results_path, stats)
          return stats