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# Obey the 15 commandments.
# When in class Before entering a classroom, a library, a concert, a lecture, a play, or in the librarya movie, put your cell phone on vibrate. PLEASE.
# Entering or exiting a building: look behind you to see whether anyone else is coming through the same door in the next 5 seconds. If the door will slam in the face of the person behind you, hold it open.
# If you see someone right outside, and opening the door would involve no more effort than extending your arm, go ahead and give it a push.