Question: 9 . [ 1 5 points ] From the languages below, which are context - free? Give short explanations. a . L = { 0

9.[15 points] From the languages below, which are context-free? Give short explanations.
a. L ={0^n ww^R 0^n : n >=0, w in {0,1}}
b. L ={0^n 1^j 0^n 1^j : n, j >=0}
c. L ={0^n 1^j 0^j 1^n : n, j >=0}
d. L ={0^n 1^n 2^j : n <= j}

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