DO, do

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 DOD    TO LIFT UP SOMETHING HEAVY                   
 DOI    POUNDING DEVICE TO MAKE FLOUR                
 DOI    A PILE OF STUFF                              
 DOI    TO STUMBLE AND FALL                          
 DOK    TO CHOP                                      
 DOK    TO MEASURE THE LENGTH OF                     
 DON    A STONE STEP                                 
 DONG   TO ASSUME SOMETHING IS SOMETHING             
 DONG   BUSINESS; SHOP                               
 DONG   TO TAKE RESPONSIDILITY                       
 DOR    MANY; A LOT