[Gmsh] 3D mesh between/inside extruded cubes

[Levente07]

Dear GMSH Users,

I'm a beginner of using GMSH. The following problem I have: I make a big
cube and a little cube inside of the big cube, both of them made by using
extrusion command.
(see the attached file) When I want to generate the 3D mesh, then it isn't
meshing the volume among the big and little cube, but only the volume
inside the little cube. What do I wrong?

Regards
Levente
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