code: def check_entry(self, entries, *args, **kwargs):
          
          verbosity = kwargs.get('verbosity', 1)
          user_total_overlaps = 0
          user = ''
          for index_a, entry_a in enumerate(entries):
              # Show the name the first time through
              if index_a == 0:
                  if args and verbosity >= 1 or verbosity >= 2:
                      self.show_name(entry_a.user)
                      user = entry_a.user
              for index_b in range(index_a, len(entries)):
                  entry_b = entries[index_b]
                  if entry_a.check_overlap(entry_b):
                      user_total_overlaps += 1
                      self.show_overlap(entry_a, entry_b, verbosity=verbosity)
          if user_total_overlaps and user and verbosity >= 1:
              overlap_data = {
                  'first': user.first_name,
                  'last': user.last_name,
                  'total': user_total_overlaps,
              }
              self.stdout.write('Total overlapping entries for user ' +
                                '%(first)s %(last)s: %(total)d' % overlap_data)
          return user_total_overlaps
docs: With a list of entries, check each entry against every other