Contents(x): Example 9/9
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Contents(<e>) = {E’ ® ·E, E ® ·E+T, E ® ·T, T ® ·T*F,
        T ® ·F, F ® ·(E), F ® ·i }
Contents(<E>) = {E’ ® E·, E ® E·+T}
Contents(<T>) = {E ® T·, T ® T·*F}
Contents(<F>) = {T ® F·}
Contents(< (>) = {F ® (·E), E ® ·E+T, E ® ·T, T ® ·T*F,
       T ® ·F, F ® ·(E), F ® ·i }
Contents(<i>) = {F ® i·}
Contents(<E +>) = {E ® E+·T, T ® ·T*F, T ® ·F, F ® ·(E),  F ® ·i }
Contents(<T* >) = {T ® T*·F, F ® ·(E), F ® ·i }
Contents(< (E >) = {F ® (E·), E ® E·+T }
Contents(<E +T >) = {E ® E+T·, T ® T·*F }
Contents(<T*F>) = {T ® T*F· }
Contents(< (E ) >) = {F ® (E)· }