Cube File D GEOMETRY Cube/Spider Problem Help..?

GEOMETRY Cube/Spider Problem Help..? - cube file d

Hello to all .. I really need the answer to this problem, then I would be really grateful if you help me .. THANKS

A spider is at the top (S) in this cube. (8 corners of the cube are (S, A, G, B, E, D, C, F)

Copy and paste in your browser to view the image (a necessity to solve)
http://www1.filehost.to/files/2007-03-20_03/195358_sss.jpg

The spider is walking toward the apex (F) to where you must follow these rules.
1. The spider can just walk along the edges
2. The spider can walk on an edge only once
3. The spider can only vertical edges, never give up
4. The spider may visit the pending vertices (F) More than once. When it comes to stop F must.
One way to obtain, F. SABF is in a different way ... As U can be found?
If the position implies, as