A person has a jar of blue pills and a jar of red pills. He must take one blue pill and one red pill every day until both jars are finished. On the second to last day he finds himself in pitch black darkness (for the purpose of the riddle!) and cannot see the colors of the pills. The red and blue pills have the exact same texture, size and shape (and so do the jars) yet this man is able to take one blue pill and one red pill. How?
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