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My question is: how to make truth table for inputs on E3? There is only space for 2 bits, and E3 is written on 4 bits as I saw. Should I add more inputs for this situation or do this in different way?
Your question isn't clear but if you have 4 output states, you only need 2 bit input because 2^2 = 4, so that's enough. Hope that answers
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