Data Lines (Input) are denoted as x₁…x₄, select line are denoted as s₁ and s₂, Output is denoted as f

Alternative Diagram in ASCII :

        _______________________
       |        4-to-1         |
D0 ----|      Multiplexer      |
       |                       |
D1 ----|                       |---> Output
       |                       |
D2 ----|                       |
       |                       |
D3 ----|_______________________|
              |         |
              |         |
              |         |
              |         |
              S1        S0
Data Lines (Input) are denoted as D0...D3, select line are denoted as S0 and S1.

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