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In every sample size I've seen (from a bio class to a forum with tens of thousands of active users,) the majority can only do one alone, not the other, and the people who can do either gloat at them. Those who can only do one tend to be able to raise the right and not the left more frequently, and the few who can't do either alone get indignant when the whole group is raising eyebrows at each other and asking, "Do you smell what The Rock is cooking?"
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