aGroup5 = mesh.UnionListOfGroups([aGroup3, aGroup4], "Any Area")
print("Criterion: Any Area, Nb = ", len(aGroup5.GetListOfID()))
aGroup5 = mesh.UnionListOfGroups([aGroup3, aGroup4], "Any Area")
print("Criterion: Any Area, Nb = ", len(aGroup5.GetListOfID()))