Only when the correct buttons are pressed in order, will the signal progress through the conditional RS NOR Latches to the end. Do this continually until you have either filled all of the buttons or are satisfied with the lock. Just press a random button. Step 1 Build Your Combination Array Typically, the combination of a redstone lock is entered using levers. The function consists of AND-gates that sends a reset signal if the previous button hasn't been pressed yet.
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