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Supplement to my full answer: Digital can convert the truth table to disjunctive normal form and draw K-maps for each output bit.


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For a combinational circuit, jonk's answer about a double dabble algorithm circuit is good. To summarize, all you need is a special component and a layout that matches the double dabble algorithm. Any 4 bit circuit component that can satisfy the "plus 3 if > 4" property will work. That is, the circuit must satisfy this truth table: (The x's are "don't ...


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