Just going to point out real quick that the lower left vertical on a 7 segment display does in fact come extremely close to directly encoding even/odd. Write th

Just going to point out real quick that the lower left vertical on a 7 segment display does in fact come extremely close to directly encoding even/odd. Write them all out and see for yourself. Only the number 4 breaks the pattern. That would only leave two bits not directly encoded in segments as far as anyone has noticed.