Alas on 10/25/2008 01:40 PM, I wrote:

> To summarize:  In the special sub-case where M=1, XOR
> is as good as it gets.  In all other cases I can think
> of, the hash approach is much better.

I should have said that in the special sub-case where 
the member word has entropy density XX=100% _or_ in 
the special sub-case where M=1, XOR is as good as it
gets.  In all other cases I can think of, the hash 
approach is much better.

(I excluded the XX=100% case earlier in the note, but
I should have included it in the summary.  Sorry.)

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