- bl : cell
- block : cell_block
- block_size : cell_block
- blocks : cell_space
- bm : cell
- bs : cell
- car : cell
- cdr : cell
- cell_space_capacity : cell_space
- cell_space_size : cell_space
- first_free : cell_space
- global_env : cell_space
- marked : cell
- marks : cell
- n_cells : cell_space
- n_free_cells : cell_space
- next_free_cell : cell
- str : cell
- sym : cell
- type : cell
- value : cell