"Preferred species of this class include: (a) b, c, d, j and s each being equal to 0, a being from 1 to 3, i being from 0.1 to 3, m being from 1 to 2, and I being one or more of Na, K, Rb, and Cs; (aa) same as (a) above except h being equal to 0; (b) b, c, d, m and s each being equal to 0, a being from 0.1 to 3, i being from 0.1 to 3, and l being from 0.1 to 3; (bb) same as (b) above except h being" . . . .