Give a quick stream of consciousness before answering the following question. If, when the two parties of knights encounter one another after a month, exactly one knight changes from one travelling party to the other travelling party, that knight must be\nOptions:\n(A) P\n(B) Q\n(C) R\n(D) S\n(E) T
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Q because Q always have to travel in northern route
The answer: (B).
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