To Convert L2 = {0^i 1^n 2^n | i != n} into L1 = {0^n 1^n 2^i | i != n} , We can apply two Operations
1. Reversal of L2 !! Thus, making L2 as { 2^n 1^n 0^i | i != n }
and
2. Homomorphism as h(0) = 2 , h(1) = 1, h(2) = 0 , Thus, making L2 as {0^n 1^n 2^i | i != n} which is same as L1.
And Set of all CFLs is closed under Reversal and Homomorphism.