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The 30 Minutes you have to wait before the teacher starts the lesson, this can be take place for many reasons such as:

-Food Is being made
-Emails need to be read
-The teacher is bored
-The teacher is humiliating students
-The teacher is having a wank
At the start of every lesson with a teacher you are allowed to talk while the Noorul takes place.
by Unknown-----Unkown April 03, 2017
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