Like Candles, multiple widgets could be on a single block face.
Each button press or lever activation sends a binary additive signal, clockwise :
Upper right == 1
Lower right == 2
Lower left == 4
Upper left == 8
The reset time for a button block starts over each time a player presses any one button, to allow time for the desired combination to be established.
As for levers, there is no reset; the signal is continuous and may be preferred in some situations. Or buttons and levers could be combined in a redstone contraption (not on the same block face, mind you) for a more complicated activation or unlocking mechanism.
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