Assertion: hangover | /r/HasProperty | a single
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Source sentences:
text: "Hangover" is a single by South Korean K-pop musician Psy, produced by Yoo Gun-hyung, featuring American rapper Snoop Dogg.
text: Hangovers are still a bit of a mystery to doctors and scientists, but one thing we know for sure: There is no single factor that causes the many side effects from too much booze.