How would a cephalopod-like race breathe outside of water?

Real-life octopi can travel outside of water for awhile, but not permanently. My race is amphibious, living underwater primarily, but also coming up onto the surface if their environment becomes too dangerous, or food becomes scarce. I don't want to them to be able to hold their breath for extended periods of time, but I could always go with that if nothing else would work I suppose. What biological factors would let them breathe both air and water?

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How would a cephalopod-like race breathe outside of water?

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