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                  Class and Ass 
 
 
 Professor Laurie of Glasgow put this notice on his door:Professor Laurie will not meet his classes today. 
 
 A student,after reading the notice,rubbed out thec. 
 
 Later Professor Laurie came along,and entering into the spirit of the joke,rubbed out thel. 
 
 
 
 
 
 
 
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