Mux

 // 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:


      Nand(a=sel,b=sel,out=nsel);

      Nand(a=a,b=nsel,out=q);
      Nand(a=q,b=q,out=r);

      Nand(a=sel,b=b,out=w);
      Nand(a=w,b=w,out=t);


    Nand(a=r, b=r, out=c);
    Nand(a=t, b=t, out=d);
    Nand(a=c,b=d,out=out);









 // Put your code here:
}