[pstricks] Parallelogram in trees

[Antoine Cailliau]

Dear all,

I'm trying to build a tree with parallelograms within. I do not find
any node matching the shape and I wonder if :
- it is possible to use custom node in trees, if so, how?
- there is a simple way to do it

Thanks in advance for your answers,

Antoine C.

Ps: I attached the tree I would like to have.
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