Please strictly follow the given sequence (1-2-3) in cleaning the CFGS: 1: useless symbols (1) 2: unnecessary e-productions 3: unit productions in the given grammar a) S -> ABA |C A -> S❘a | ε B -> bB | b C -> CA b) S -> BC A -> a b B -> Є C -> DE | ε D -> BAB E-> C c) S-> BC | DaD | b A -> aD | bA | C B -> Cb C -> aB D -> bS | ε d) S-> A | B A -> aA | aC B -> bB | bC C -> cdfF D -> g | ε E-> h❘ Є F -> DE