If you can’t solve this problem you just haven’t thought enough about it. If anybody can solve this problem, please contact me, I’m in need of non-retarded friends.
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FYI, if you’re new to these sort of problems, they’re very difficult to get into unless you are already a very logical/rational person. Since these kind of people are very rare, the number of people who voted that they could solve the answer mislead the actual number of people that can in fact solve it. Guessing does not count, and neither does simply “already knowing the answer”.