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Multiplexer

It's a multiplexer.

Inputs:
White - Data
Yellow - Selector

Outputs:
Purple - Outputs selected input (for example, if the Selector input is 0, the purple output will be the same as the top input, or Input 0. If the Selector input is 1, it'll do the same thing but for Input 1. Multiplexers can be chained together to create multiplexers with more inputs, however any singular multiplexer should always have one output.