The characteristics of four metals, E, F, G and H, are given. E does not react with cold water, but it does react with steam. F does not react with water or dilute acid, but the oxide of F can be reduced by carbon. The oxide of G cannot be reduced by carbon, yet G reacts vigorously with cold water. H does not react with water or steam, but it does react with dilute acid. What is the order of reactivity of the metals, beginning with the most reactive?