This sounds like an oxymoron to me. Perhaps that sentence should be changed
to:
The boolean type can have one of three states: "true" or "false" and
"unknown".
if my boolean arithmetic is not wrong the above expression is bad.
better expressed is: "true", "false" or "unknown"...
There are two kinds of people on this earth, those who understand
boolean arithmatic and those who don't. I'm not one of them.
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