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| | Yes, you can go through every door exactly once! (Site not responding. Last check: 2007-11-06) |
 | | But, no matter which way you start, every other room has to have an even number of doors, because when you walk into the room, you close one door, and when you walk out of the room, you close a second door. |
 | | So, if you have a house with rooms that all have even numbers of doors, and the outside also has an even number of doors, then you can start anywhere you want, and end back in the room you start with. |
 | | If you have a house with two rooms that have an odd number of doors (remember, the outside counts as a room in this puzzle), and all the other rooms have even numbers of doors, then you must start in one of the odd-number rooms, and end in the other odd-number room. |
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