code: def check_valid_object_name(sequence):
      
      names = []
      for o in sequence:
          if o.__name__ in names:
              raise ValueError(
                  'A tallyable PyMC object called %s already exists. This will cause problems for some database backends.' %
                  o.__name__)
          else:
              names.append(o.__name__)
docs: Check that the names of the objects are all different.