docs: def state_size(self) -> Sequence[Sequence[int]]:
          '''The size of each state fluent in canonical order.
  
          Returns:
              Sequence[Sequence[int]]: A tuple of tuple of integers
              representing the shape and size of each fluent.
          '''
          fluents = self.domain.state_fluents
          ordering = self.domain.state_fluent_ordering
          return self._fluent_size(fluents, ordering)