On Sun, Mar 23, 2008 at 10:54 PM, Michael Reid <reid@math.ucf.edu> wrote:

find two six-letter words, each of which has the same first half as second half, and additionally, the two words differ in only two places. (one is common, the other is obscure.)

mike

Are you thinking of (rot13ed) zhhzhh and zhezhe? If so, I would probably think of both of those words as relatively common. The less common one has been used in a Simpsons episode, after all. ;-) Dave