class TWO_WAY_TREE [G] Ancestors BI_LINKABLE [G] DYNAMIC_TREE* [G] TWO_WAY_LIST [G] Descendants CONSTRUCT* Clients TWO_WAY_CURSOR_TREE [G] TWO_WAY_TREE [G] Suppliers BOOLEAN INTEGER_32 TWO_WAY_LIST [G] TWO_WAY_TREE [G] TWO_WAY_TREE_CURSOR [G]