1
                    as in collaborated
                                                
              
          
                                                      to participate or assist in a joint effort to accomplish an end                                       
              
                             conservation groups cooperated with state authorities to find a humane way to manage the area's overpopulation of deer                         
                
                                                                                                                                                                          
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              2
                    as in united
                                                
              
          
                                                      to form or enter into an association that furthers the interests of its members                                       
              
                             several industrialized nations cooperated in a trade agreement to reduce or eliminate tariffs                         
                
                                                                                                                                                                                                                                                              
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  Merriam-Webster unabridged




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