People with working nervous systems can do all sorts of wondrous things. Talk, walk, differential calculus - you name it. One thing you ought to be able to do is recognize a number if I draw it with my finger on your palm. Unless I do it confusing. For example, 6 and 9 are tricky if you don't know which way I'm drawing it. We were also specifically told to steer away from 7 - I can't imagine why.
Bottom line, if you ever hit your head and are reduced to blind guessing, don't guess 6, 7, or 9. Full disclosure, I usually lead with a 4.
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