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1990-03-28
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260b
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9 lines
\ Answer for problem 2.2
\ Author: Dickson Cheng 03/28/90 13:16:04.91
\ ?DO will loop 0 times if first = last.
\ Since there would be possible a empty stack, so use ?DO in the definition
\ of CLEAR to make sure it still runs if the stack is empty.