Converting BNF to EBNF

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I need to know how to convert the next BNF to EBNF so it will help me understand more how they work

S-> aI1I2 | epsilon
I1-> I1e | b
I2-> cd | cS


                      
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                  陌清茗        
                
              
                            
                2021-01-14 02:12
              
            
            
                                                                       
Please consider these:


Cheat Sheet
EBNF to BNF tricks.

                                                                        
                                                        
            
            
              
                
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