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[tlaplus] Usage of the ! operator


  According to the book, I could find only two usages of the ! operator :- in EXCEPT and in operator names.

 However, in the formal proof of paxos (https://github.com/tlaplus/v1-tlapm/blob/master/examples/paxos/Paxos.tla), on line 250, the ! operator has been used and I am not quite clear about the context in this case.

 I will greatly appreciate it if someone can explain the meaning of this particular line of code: 

<2>1. PICK m \in msgs : Phase2b(a)!(m)   


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