three R's
plural noun
1
                    
                                          
              
          
                                                      : the fundamentals taught in elementary school                                      
                
                                
            especially                
          
                                                      : reading, writing, and arithmetic                                      
            
            2
                    
                                          
              
          
                                                      : the fundamental skills in a field of endeavor                                      
                
                    
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  Merriam-Webster unabridged




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