[tlaplus] How to remove an iterm from a Sequence?

[diaozengqi@xxxxxxxxxxx]

Dear all,

I'm writing a TLA program to process a message queue whlle I must remove a duplicate item from the sequence when a new message is added to the message queue. How could I do this with TLA module? Or I must write a function to deal with it?

Thanks

Regards

Diao Zegnqi.

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