A+A, A+C, A+D, A+E, A+F, A+H, A+J, A+K, A+M, A+N, A+R, A+S, A+T, A+Y, C+C, C+D, C+E, C+F, C+H, C+J, C+K, C+M, C+N, C+R, C+S, C+T, C+Y, D+D, D+E, D+F, D+H, D+J, D+K, D+M, D+N, D+R, D+S, D+T, D+Y, E+E, E+F, E+H, E+J, E+K, E+M, E+N, E+R, E+S, E+T, E+Y, F+F, F+H, F+J, F+K, F+M, F+N, F+R, F+S, F+T, F+Y, H+H, H+J, H+K, H+M, H+N, H+R, H+S, H+T, H+Y, J+J, J+K, J+M, J+N, J+R, J+S, J+T, J+Y, K+K, K+M, K+N, K+R, K+S, K+T, K+Y, M+M, M+N, M+R, M+S, M+T, M+Y, N+N, N+R, N+S, N+T, N+Y, R+R, R+S, R+T, R+Y, S+S, S+T, S+Y, T+T, T+Y, Y+Y