The next day, the girls are supposed to take an exam, but they're late and won't show up for the meeting. The teacher is supposed to administer the exam, so they'll be studying in separate rooms until the exam starts at half-past-one o'clock. The girls ignore the teacher's warning, and the teacher tells them to go quietly study until the test starts. The girl is distracted by a game of numbers, and she can't figure out how to stop at 21, which is the winning number in the game. She's so distracted that she doesn't notice that the teacher is counting the numbers until the time comes, and that's when she loses the game, which is why she's not allowed to play the game again.