D3 has a variety of layouts for directed graphs that are strict trees, such as the following:

A
|\
B C
 / \
D   E

I need to draw a hierarchy of nodes that is not a tree, but is a directed acyclic graph. This is a problem for a tree layout, because several of the branches converge:

A
|\
B C
 \|
  D

Does anyone know of a D3 layout for general hierarchies? Or alternatively, some clever hack to the existing treelayout? I've noticed GraphVis handles this situation well, but D3 produces a graph that better suits the requirements here.

javascript d3.js
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