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I'm right-handed, but I can do many things to a greater or lesser dexterity with both hands. I can write (badly) with either hand, though my right-handwriting is much better. I shoot pool left handed by preference. However, I can only wink my left eye, and that rather badly (I have to squinch up my whole face). I can also snap my fingers only with my left hand. Right hand snap attempts are completely useless.