I have some questions about polygons (when used in meshes in particular) 
that are probably going to seem sorta dumb.  First of all, are they limited 
to 3 or 4 edges, and if so, why?  Secondly, does every edge of every 
polygon in a mesh have to be shared by one (and only one) neighboring 
polygon?  For example,

 -----------
|     |     |
| 1   | 2   |
|_____|     |
|     |     |
| 3   |     |
|_____|_____|

would be wrong, but,

 -----------
|     |     |
| 1   | 2   |
|_____|_____|
|     |     |
| 4   | 3   |
|_____|_____|

would be fine.  If so, why?  These questions have really been nagging at me 
lately, so any enlightenment you guys can provide would be very 
appreciated.  Thanks in advance.

Jordan

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