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A BNF grammar that is equivalent to the following EBNF grammar [ e | ] is S x f Y x c | e |

A BNF grammar that is equivalent to the following EBNF grammar
[e|]
is
SxfY
xc|e|
Y1
What should go in the empty slot? Separate symbols in your answer by exactly ONE space. For example, if the answer is a x,x, you should write axx. No extra spaces in the middle.
The correct answer is: aby
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