Digital Logic design interview questions
The question is ambiguous, although sometimes interview questions are intentionally ambiguous to prompt a discussion of the ambiguities.
One way to look at it is, if you are verifying a design for a 4-input sorting network, how many input sequences are needed to be sure the implementation is correct. If you don't know anything about how it's implemented, then you need to test all $4!$ permutations of four values to be absolutely certain the implementation is correct.
Another way to look at it is, if you manufacture the circuit, how many input sequences do you need to apply to each device during testing to be sure the circuit was manufactured correctly. In this case you would usually take the design as a given, so you don't need to cover all $4!$ permutations, you just need enough inputs to cover the interesting cases for each element of the circuit. I'm guessing this was the intention of the question, and I'm guessing that only two cases are considered interesting for each MinMax2 component (A>B and A
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