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need help for dot language



hi,
I am trying to use dot language to visualize a graph for my comp621
project.

What I have gotten is like:

           A
          / \
         B   C
        / \  /\
       D   E F G
       |
       H
       |
       I

What I want is like:

       D\      A
       | \    / \
       H  \--B   C
       |     |  / \
       I     E F   G


ie. How can I put node D to the top row?

Thank you very much.

lin