arc between edges

Draw And-Or tree - need to draw arcs between/across edges

Hi all,

Not sure if this problem was asked before...

I have problems in drawing and-or trees using Graphviz. I need to draw arc between/across edges, e.g.
http://en.wikipedia.org/wiki/File:Andortree.png
I need to draw the arc like the one between (P,Q) and (P,R)

How can I draw such arc? Is it possible to use the custom cluster?

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