Listening to people around Beijing over the past few days, I've noticed a couple of things about a common Chinese word. The Wiktionary gloss for 对 (dui4) suggests the pattern:
Yes! Correct! I agree!; The word is used often in spoken language. It is common to repeat the word three times when you want to make clear that you understand and agree.
My impression is that a single duì is common, and three-fold repetition is also common, and sometimes even five in a row (grouped 3+2?), but not two or four. (I think I heard a double duì once, but it was more like two phrases "duì, duì".)
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