0Hi,02br 02br 00Look at the sentences below and please tell me why one has to be 'on' and the other 'at' when both are referring to the back side. Of course, one is used in reference to a human being, whereas the other is used with a thing.02br 02br 00Please put a self-sticking note on the back of Jack.02br 02br 00Please put a self-sticking note at the back of Jack's chair. 0-
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— Khoff
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