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Mar 27, 2017 at 8:10 comment added user9482 @cfr Not only hard, but I'd say impossible. The limit for this approach to be effective is probably between 20 and 30 students. The number of students was not specified when I wrote this answer.
Mar 26, 2017 at 23:49 comment added cfr Hard with 90, though. At least, I'd find it hard with 90.
Mar 24, 2017 at 9:36 history answered user9482 CC BY-SA 3.0