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NIST proposes barring some of the most nonsensical password rules
(arstechnica.com)
This is a most excellent place for technology news and articles.
20 character all lowercase is very secure as long as its random words / letters that would make it unguessable by knowing you.
Edit: you could also prefix it if you think you'd have to read it
"This question is stupid fuck nuts house gravel neptune cow."