I am a mechanic and have 200 or so cars. Each car has error codes I want to graph. And ultimately visualize and compare similar automobiles based on their error codes. Do I create nodes named Car 1, Car 2 … Car N… etc., and then create edges as a list of their respective error codes? And only have edges connecting the nodes if they have error codes in common? Then, how do I compare them? Say, Car 1 has error code 1, 2 and 3 and Car 2 has error code 2, 3 and 4? How do I compare them on a graph?