Question: Write a BNF grammar (with as its start symbol) for the set of ALL (and ONLY) the strings that are made of 0 or more

Write a BNF grammar (with as its start symbol) for the set of ALL (and ONLY) the strings that are made of 0 or more occurrences, in any order, of the letters a and/or b in which the total number of occurrences of the letter a is even.

I think it would start off something like this:

::= | epsilon

::= .....

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