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One day professor couldn't stay for his afternoon classes, so he put a notice on the door , which read the follows:'Professor Evans won't be able to meet his classes this afternoon'
Then he went to put his coat and on his way out saw that some student had rubbed off the letter 'c' in the word 'classes' on the notice. The professor smiled and rubbed off the letter 'l' in the word 'lasses'
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