Prove that a graph is or isn't hamiltonian

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Prove that graph is hamiltonian or if it isn't proof that it isn't.

I tried everything from Ore to to Dirac. If I try to prove that it is not hamiltonian, then I can't find which vertices$\in S$ to remove to prove it by $\omega (G - S) > |S|$.

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Hint: the "perimeter cycle" goes through all but three vertices. Can you deform it a bit so it goes through all vertices?