During a snowstorm, Owen tracked the amount of snow on the ground. When the storm began, there were 3 inches of snow on the ground. Snow fell at a constant rate of 3 inches per hour until another 9 inches had fallen. The storm then stopped for 6 hours and then started again at a constant rate of 2 inches per hour for the next 4 hours. As soon as the storm stopped again, the sun came out and melted the snow for the next 4 hours at a constant rate of 2 inches per hour. Make a graph showing the inches of snow on the ground over time using the data that Owen collected.