To arrange nodes in a Sugiyama layout:
All nodes in the active window are arranged according to a Sugiyama layout, a layered, tree-like layout that tries to minimize crossings.
Note: [2.25in] The graph in the active window cannot have cycles.
Warning: [1.75in]
If the number of nodes in the tree is too great, or
the hierarchy is too deep, or you run out of virtual
memory, the Sugiyama implementation fails.