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well, i tried once and it was hard because i lose a lot of time to make organisations, students talk and talk they didn´t listen the instruccions because they make much noisy and the number of each grade is high.

I do it when is extremely necessary. But when this info i´m goint to try it again :)

I agree with you, when the group is too big it is difficult to organize them and also it takes them more time than the planned to get together, however, if we practice one or two times per week they will learn how to do it faster, and eventually it will not take them that long, let's keep trying.