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To traverse the instance definition to get geometry only once

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Hello guys,
I want to export Rhino model to Parasolid.
While traversing Rhino model I am getting instance reference object. I have added code to iterate instance definition block to get geometry for instance reference. While traversing I am facing problem that each instance reference object have UUID for instance definition. If instance definition have instance reference as geometry then I am getting same geometry again and again please refer the below image.
04-12

Could you please help me to traverse the instance definition to get geometry only once.

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