Let language L1 = {0,1}* if another language L2 is CFL.
L1 = empty set if another language L2 is not CFL.
L2 = a language the is R.E and its complement is R.E.
What can we say about L1 and L2?
is L1 and L2 are regular, CFL, CSL, R.E or finite or infinite.