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Which one is the grammar of the language {a 2n | n>=0| U {b 2n+1 | n >=0} ? S -> A | B A

Which one is the grammar of the language {a2n | n>=0| U {b2n+1 | n >=0} ?

S -> A | B

A -> | abA

B -> | baB

S -> A | B

A -> | aaA

B -> | bbB

S -> A | B

A -> a | aaA

B -> b | bbB

S -> A | B

A -> | aaA

B -> b | bbB

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