Define holes of model, which is result of Fuse operation for set of simple solids

Hi Team,
I have a task to find all holes in a fused model. In case hole in face it is clear how to solve it.
But mostly I am interested in findin holes, which were constraucted by several elements after fusing them.

Any hint would be useful.
With respects, Eugene.

Eugene Zaliznyak's picture

Is there no any solution ?