[Help-glpk] Literal empty set of a multi-dimensional set

[Tavs]

Hello everyone.

I've got the following problem: there's a set B declared as follow
B within A cross C
and it may be empty. 

Is it possible to write an initialization statement (default, :=) with
literal empty set for B? Sort of default {}
If not, how should I declare B?

thank you for your attention

tavs
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