In the correct grammar above, what is the length of the derivation (number of steps starting from S to generate the string a l b m with l ! m?

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1.	In the correct grammar above, what is the length of the derivation (number of steps starting from S to generate the string a l b m with l ! m?
A.	max (l, m) + 2
B.	l+m+2
C.	l + m + 3
D.	max (l, m) + 3
Answer» B. l+m+2

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