I believe that these three graphs are non-isomorphic, because the first graph contains a 6 cycle, which is not present in the other two graphs. The 2nd and 3rd graphs are not isomorphic because they have different numbers of 5 cycles.
2026-05-17 06:04:50.1778997890
Are these three graphs isomorphic?
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The inner ring of the third graph consists of two disjoint 5-cycles. If you "drag" one of them to the outside of the (current) outer ring, the isomorphism to the center graph will be clear.
You are correct that the first graph does not have a 5-cycle, so it cannot be isomorphic to the other two.