or

// 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/Or.hdl

 /**
 * Or gate:
 * out = 1 if (a == 1 or b == 1)
 *       0 otherwise
 */

CHIP Or {
    IN a, b;
    OUT out;

    PARTS:
    Nand(a=a, b=a, out=c);
    Nand(a=b, b=b, out=d);
    Nand(a=c, b=d, out=out);

// Put your code here:
}