[30 points] The following context-free grammar G is ambiguous. Give an equivalent unambiguous grammar. The terminal alphabet of G is fa, b, c, G), +, -,*) . G has only one variable, namely the start symbol E. The productions of G are as follows: (a) E-E+E (b) EE-E (c) EE*E (d) E(E) (e) E - a (E) E+b (g) Eo