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/* 
Original code by Nick Brenn
Modified by Marc de Vinck
Make Projects Arduino-based 4WD robot
http://makeprojects.com/Project/Build-your-own-Arduino-Controlled-Robot-/577/1 
 */
#include <AFMotor.h> 
//AF_DCMotor motor1(1, MOTOR12_8KHZ);
AF_DCMotor motor2(2, MOTOR12_1KHZ);
AF_DCMotor motor3(3, MOTOR12_1KHZ);