code: def _consistent(self):
          
          if len(self.__order) != sum(len(values) for values in self.__index.values()):
              return False
          import copy
          tmp = copy.copy(self.__order)
          for key, values in self.__index.items():
              for value in values:
                  if value.name != key:
                      return False
                  if value in tmp:
                      tmp.remove(value)
                  else:
                      return False
                  if isinstance(value, CP2KSection):
                      if not value._consistent():
                          return False
          return True
docs: Checks the constency between self.__index and self.__order