What is the 15 minute rule?

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2. #minute
3. #patiently
4. #amongst
5. #unlock
6. #chatting
7. #busted
8. #teacher
9. #their
10. #class
11. #students
12. #ramchandani
13. #while
14. #campus
15. #themselves
16. #february
17. #waiting
18. #classroom
19. #leave
20. #minutes