by Steve

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Adds numbers (binary) (lever on is 1, no matter the position). You can link together multiple for larger number outputs. 1 adder is 4 possible digits (0-3), 2 adders is 8 digits (0-7) and so on. To link adders, destroy the lever on the orange wool on your second machine and redstone lamp with light gray wool on your first one and connect them via redstone. I built this from the logic gate map on page 370 of How To Invent Everything by Ryan North.

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