William Hubbs posted on Sat, 10 Apr 2010 12:18:41 -0500 as excerpted:

> - a phrase captcha (complete the phrase)

The thing I've always read about these is that they tend to discriminate 
against those for whom the language isn't their native language.

Math problems are generally agreed to be reasonably universal, however, 
tho that can change if wording is chosen to try to defeat a machine 
solution (running into the language problem again).  Spelling captchas... 
tend to run into problems with folks that can't spell.  That's apparently 
a big enough problem a lot of sites try and reject spelling captchas.

Perhaps a mix such that users can try again with a different category, 

Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

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