I have simulated a 4 bit magnitude comparator on proteus and there are two things I would like to know for clarification.?

A) How do I justify my design of the 4 bit magnitude comparator that gives the results A=B, A>B AND A<B ? If I had to explain why the circuit works the way it does?

B) What changes have to made in the design to find the third result from any two of the three results (A = B, A > B, A < B)

For reference I have included the circuit. Thank you

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