$ EXAMPLE GRAMMAR FROM PAGE 266 OF COMPILER DESIGN THEORY
<A> -> <B> <C> 'c';
<A> -> 'e' <D> <B>;
<B> -> ;
<B> -> 'b' <C> <D> <E>;
<C> -> <D> 'a' <B>;
<C> -> 'c' 'a';
<D> -> ;
<D> -> 'd' <D>;
<E> -> 'e' <A> 'f';
<E> -> 'c';