[Gmsh] elements are missing in a 3D mesh

[gael jarry]

Hi all and thanks for GMSH,

I try to make a simple 3D structure with 4 small cubes in 1 big cube in 
order to have 5 physical volumes.
I follow the steps :
- point definition
- line definition
- line loop definition
- plane surface definition
- surface loop definition
- volume definition
- physical volume definition

I have no error while running gmsh -3, but I find that some elements are 
missing.
Any hints?

Thanks,

Gael Jarry
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