(thing) by Noether Wed Jul 12 2000 at 21:25:31
Surface of genus one that looks like this: 

        ..----..
     .-          -.
   -                -
  |     .------.     |
   .   --______--   .
    .              .
     .__        __.
        ---__---

Can be created by identifying 

  --------------
 |      B       |
 |              |
 |A            A|
 |              |
 |      B       |
  --------------
the edges with the same label.
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