1993 Oldsmobile Ciera Master Cylinder Brake Lines

I need to know which line coming off the master cylinder is the RIGHT REAR line, the line has a hole in it, tried patching for temporary use, but the pressure is too great. I need to pinch it off at the master cylinder temporarily so fluid does not go to the right rear and the pedal doesn't go to the floor. I can't get the car into a shop for 2 weeks and the car can't be driven without decent brakes. All other brakes work fine, but no fluid will build up with the right rear leaking. Thanks.