[Gmsh] How to add huge number of facets to a physical surface group quickly?

[Yang, Jun]

Hi,
I'm trying to build a nano-structure model using Gmsh. The model contains
hundreds of cubes inside. Is there a way that I can add all the facets of
these cubes to a physical surface group quickly? It is painful to choose
the facets one by one with a mouse.
Thank you!

Jun
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