1. But#

Assemble two meshes to form a new one.

The two meshes to be assembled can come from operators: LIRE_MAILLAGE [U4.21.01], [], DEFI_MAILLAGE [U4.23.01], ASSE_MAILLAGE [U4.23.03],…

That is to say, they may contain ordinary meshes or supermeshes carrying macroelements.