Subj : Re: puzzle
To   : comp.programming
From : CBFalconer
Date : Sun Jul 10 2005 05:11 pm

spinoza1111@yahoo.com wrote:
> 
.... snip ...
> in this thread, I have repeatedly acknowledged that I did not have
> enough erudition to think of, or in my case from grad school
> remember, the XOR solution.
.... snip further pointless erudition ...

FYI, the entire secret of the XOR solution is exposed in the
following truth table:

   a     b      XOR(a,b)
   =     =      ========
   F     F        F
   F     T        T
   T     F        T
   T     T        F

Some have been known to learn this without attending grad school.

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.