Regular expression equivalent to following automaton?

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Having a little trouble wrapping my head around this one.

What is a regular expression equivalent to the following automaton?

enter image description here

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Hint. First consider the automaton obtained by replacing the two transitions labelled by $\{a,b\}$ by transitions labelled by $c$: enter image description here

Find a regular expression for this new automaton and then replace $c$ by $\{a,b\}$ in the result.