Python Challenge 10?

[Greg Ewing]

Can someone give me a hint for No. 10? My MindBlaster
card must be acting up -- I can't seem to tune into
the author's brain waves on this one.

I came up with what I thought was a perfectly good
solution, but apparently it's wrong. :-(

-- 
Greg Ewing, Computer Science Dept,
University of Canterbury,	
Christchurch, New Zealand
http://www.cosc.canterbury.ac.nz/~greg