Convert BNF to EBNF

I need to know how to convert the next BNF to EBNF so that it helps me understand how they work.

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

note: epsilon means empty set

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1 answer

Please think about this:

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Source: https://habr.com/ru/post/1380872/


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