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[tlaplus] How to explore states with all subset of a set ?


I have a set `Files`. I want TLC to explore next steps of my `process` with all subset combinations of `Files`.

process DeleteX \in DeleteWorkers
process DeleteOp:
someFiles := CHOOSE x \in SUBSET {p \in Files: p.size < TargetSize}: TRUE;
await Cardinatlity(someFiles) > 0;

... next steps ...
end process;

But i see that next steps are disabled with Total/Distinct states as 0/0.
I think it is because CHOOSE always takes `{}`.

How can i tell TLC to explore all `someFiles` where it is a subset of `Files with my predicate` applied ?


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