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Cavernous Openings and Bottomless Buttholes is the scale used to measure the largest of sphincters. It is the named the COBBS scale after the largest anus ever found. It is the top end of the scale. The small side of the scale is Klosed Coccyx and goes up. The measurement starts when the subject starts to leave stainZ in their underwear. The term is also used in spelunking because many caves are smaller than the COBBS scale measures.
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