3+4=7 points) Give CFGs that generate the following languages. Your CFGs should have at most 2 variables. Unless specified otherwise, the alphabet is -(0 (a) Li-fuel to is a balanced string of parentheses and brackets). The alphabet here is b) L2 is the collection of all strings that contain at least one1 in their second half (if the 1} (thatcontain atleast one 1 in their wo string is of odd length, we exclude the middle symbol to construct the second "half"). In other words, L2-(uu l u *, u *1E* and lu2 lul