You should probably read it and find out, provide us with more information
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1. weather (cool, windy) 2. holidays (thanksgiving) 3. Certain sickness (allergies, cold, flu, etc.)
I can't find a fourth one, but i hope that the ones given are a good start :)
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I dont know but if you could add more I could help you on 25
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The emergence of online tools to assist with education begs the question of if teachers should worry about the risk of violations of student privacy or not.
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