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4-bit adder -- smallest

I believe this is the smallest 4-bit adder around, at least from what I've seen browsing the workshop.

Add two 4-bit unsigned numbers.

If you're standing with the buttons on front of the trench, the top number is given by the top 4 buttons, LSB rightmost, and the second number by the bottom 4 buttons. The answer is displayed on the wall, LSB rightmost.