// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: projects/01/Mux.hdl

/** 
 * Multiplexor:
 * out = a if sel == 0
 *       b otherwise
 */

CHIP Mux {
    IN a, b, sel;
    OUT out;

    PARTS:
    // Put your code here:
    //!sel
    Nand(a=sel, b=sel, out=w1);

    //X=a*!sel
    Nand(a=a, b=w1, out=w2);
    Nand(a=w2, b=w2, out=w3);

    //Y=b*sel
    Nand(a=b, b=sel, out=w4);
    Nand(a=w4, b=w4, out=w5);

    //out=X+Y
    Nand(a=w3, b=w3, out=w6);
    Nand(a=w5, b=w5, out=w7);
    Nand(a=w6, b=w7, out=out);
}