What I can imagine she did is maybe she wrote each of the workdays, the dates, on a piece of paper. She would have 50 pieces of paper, and then she turned them all upside down, or maybe she closed her eyes, and then she moved them all over her table. Then with her eyes closed, she randomly moved them to either the left or the right of the table. If they move to the left of the table, then those are the days she'll take bus A. If she moves them to the right of the table, those are the days she takes bus B. That's how she can make sure that this is truly random. All right.