"stevenvh" <nomail@nomail> wrote:
>   difference { A  difference { B C } }
>
> will subtract B from A, but C will be added again.

Thinking about it, you're right - partially. It will possibly not work as
expected if C is a union, as it will be changed to a merge in the process.


> I think my problem was that I tried to use 'inverse' and that IMO behaves oddly.

Hm... didn't you put the "inverse" on the "door" box? Note that

    difference { object{A} object{B} }

is the same as

    intersection { object{A} object{B inverse} }

and not vice versa.

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