Extracting common character strings from multiple vectors of different lengths

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Is there function in R to find the common characters in multiple vectors (of different lengths). For example, if I have 3 vectors...

 a1 <- LETTERS[1:7]


                      
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                  礼貌的吻别        
                
              
                            
                2020-12-10 08:39
              
            
            
                                                                       
Yes:

Reduce(intersect,list(a1,a2,a3))

                                                                        
                                                        
            
            
              
                
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