mathematics 17:27 21 Apr 2011 #1 
3.141592653589 18:25 21 Apr 2011 #2 
mathematics 19:23 21 Apr 2011 #3
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mathematics 17:27 21 Apr 2011 #1 3.141592653589 18:25 21 Apr 2011 #2 mathematics 19:23 21 Apr 2011 #3