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Use "last-name" in a sentence
"There she is, for anyone to find, first-name last-name, her blond, pointy face warping my screen."
"Then, I went from the school, past the station, and walked a few blocks more to go to the cheap udon/soba place with my friend, Kim last-name."
"It's also worth noting that Eric keeps us on a first-name basis with Hillary while he keeps Obama on a last-name basis and thus at a formal distance."