A and B arrive at 8:30 a.m. C, D or E arrive at 8:50 a.m. F or G arrive at 9:10 a.m. H, I or J arrive at 9:30 a.m. K and L arrive at 9:50 a.m. M or N arrive at 10:10 a.m. O, P or Q arrive at 10:30 a.m. R, S or T arrive at 10:50 a.m. U, V, W, X, Y or Z arrive at 11:10 a.m.