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There were ten brown Beavers building up a dam 
Ten brown Beavers building a dam 
And if one brown Beaver left and swam, 
There'd be nine brown Beavers building up a dam. 
 
(Continue going 8,7,6,5,4,3,2,1, then....) 
There'd be no brown Beavers left to build up a dam. 
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