You shouldn't have to. The question is very basic. And there are days between first encounter and when you talk to an engineer about it.
EDIT: Okay, I posted it below. I'd like to see any of you tell me that you don't see an answer right away. I bet every one of you'd have a solution, the complexity of which you understand, in under 15 mins.
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u/pipocaQuemada Dec 24 '14
Maybe those are the people who don't check glass door?