This is an example room of someone who has a single room. 

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This is an example of a double room. 
It is the same size as the singles above, but the difference is two
students will use the rooms together.

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Having either a single or double is not something that you can ask for.  This is something that is just given to you by luck.  For example you have a room mate, but he graduates and you lose your room mate and nobody new enters the dorm.

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