Which of the following graphs (see attached) is not isomorphic to the others, and why?
All graphs have 5 nodes
All graphs have 6 arcs
All graphs have 2 nodes of degree 3 and 3 nodes of degree 2
No graph has parallel arcs
No graphs have a loop
All graphs have a cycle
No graph is complete
What other characteristics can I look for to prove that one of these 5 graphs is not isomorphic?
(Also sorry for the bad paintbrush skills)