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[tlaplus] How to modify an element of Sequence

Dear friends:

I have variable defined as a Sequnce in my Spec ,  and I need to modify the value of  one of its element (with the index m) in the next step .

So I think the _expression_ below is possible:

Queue'  = SubSeq(Queue, 1, m-1) \o  << NewValue of m>> \o  SubSeq(Queue, m+1,  Len(s))

More over,  I want to know is there any other convenient method? 

Thanks a Lot!


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