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The video was produced on:
7 December 2017
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EXTENDS Integers, Sequences Remove(i, seq) == [j \in 1..(Len(seq)-1) |-> IF j < i THEN seq[j] ELSE seq[j+1]]
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ABSpec.tla
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\A v \in Data \X {0,1} : (AVar = v) ~> (BVar = v)