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Synchronizer contains information about the RedPower mod.
Acting like a lazy AND gate, the synchronizer will produce an output pulse after both input sides have received a signal, even when one of the signals is no longer present. This behavior is useful if you have a contraption that needs data but can only accept that data at specific times. Just hook one of the inputs to the data and one of the inputs to when you can accept that data. It can be reset by a pulse to the bottom side.