A 4-to-1 multiplexer has four inputs ($I_0, I_1, I_2, I_3$), two select lines ($S_0, S_1$), and one output ($Y$). The select lines determine which input is passed to the output.
The truth table is as follows:
| $S_1$ | $S_0$ | $Y$ |
|---|---|---|
| 0 | 0 |
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