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[tomangelo]

Code:
turn(Left); // Always means turn(90);
turn(Right); // Always meant turn(-90);

I would do this more like

Code:

turn(left()); //turn left by 90 degrees
turn(left(50)); //turn left by 50 degrees

and similar for turning right. But if we'll implement preprocessor commands, then it could be

Code:

#define left -90;
#define right 90;
turn(left); //turn left by 90 degrees
turn(left(50)); //turn left by 50 degrees