Basic question about constructing composite shapes in TGeo


I have four shapes from which I would like to subtract three of them from the other.

This means: The shape A is the one which shall remain.
And B, C and D are shapes I want to subtract from it.

In case of A, B and C it works for (A-B)-©.
Also for (A-B)-(D).

But how to do that for B, C and D?
With the help of I don’t get it and hence, I tried lots of combinations.
Can someone please figure that out (so I can drop other mistakes)?
Thank you in advance!

I guess @agheata can help you.

The expression is evaluated from left to right, parentheses get precedence at a given level. So you can do:

Thanks! Does that mean all these variants are the same?

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