It is the Chinese Valentine's day today. I shall put up a quiz for you to ponder:
The shortest way to walk from place A to B is to go south for two miles, and then to the north for two miles. How far do you have to walk from place A to B by going east ?
I may well provide a Chinese translation: 從A地到B地最短的方式是先南向行兩英里，然後向北行兩英里。問:從A地到B地，往東行有多遠?
PS. Don't be paranoid. This is a question on mathematics, not some leg-pulling IQ test.
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