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[tlaplus] Converting TLA+ spec to PlusCal

Hello all,
I have a TLA+ spec that I'd like to convert to PlusCal, but I'm facing some issues as I don't know how to convert a few parts of the specification.

1. I want to have this predicate as a process, but I'm not sure how to convert this part "\E n \in CN, p \in BOOLEAN :"

UpdatePredicate ==
\E n \in CN, p \in BOOLEAN :
/\ predicate[n] => p \* Only monotonic updates are make the algorithm to terminate.
/\ predicate' = [predicate EXCEPT ![n] = p]
/\ UNCHANGED <<bcNode, bcValue, output, msgs>>

2. I want to specify global variable bcValue in Init based on the set of bcNode

/\ \/ bcNode \in CN /\ bcValue \in Value
    \/ bcNode \in FN /\ bcValue = NotValue

Thanks a lot!!

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