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                                                      : a group of two successive letters whose phonetic value is a single sound (such as ea in bread or ng in sing) or whose value is not the sum of a value borne by each in other occurrences (such as ch in chin where the value is \t\ + \sh\)                                      
                
                    
2
                    
                                          
              
          
                                                      : a group of two successive letters                                      
                
                    
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  Merriam-Webster unabridged




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