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The phrase omo-ropmo bilak is a past-oriented expression used by members of the Yupno, an Indigenous group in Papua New Guinea, that translates to "a couple of years ago." Rafael Núñez and colleagues recorded Yupno speakers explaining several of these temporal-related words and phrases and coded each speaker's manual gestures. Previous research has found evidence of Spanish speakers referring to the front/back axis to describe events in time, and many researchers believe that this tendency to make temporal distinctions along imagined linear axes is universal. However, Núñez and colleagues claim that this tendency is not in fact ubiquitous.