Take a look at the follwing grammar:

L_PAL(G) = (L_PAL(V),L_PAL(C),L_PAL(P),L_PAL(S)) where

L_PAL(V) = {a,b,c}

L_PAL(C) = {A}

L_PAL(P) = {A ::= c, A ::= aAa, A ::= bAb}

L_PAL(S) = A

Write the derivation steps of the following sentences to determine if they are valid in this grammar:

a) a³ b² c b² a³

b) b² a c a b²