1) Some People Who Can, Shouldn't. (2) Some People Who Should, Won't.

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(1) Some people who can, shouldn't.
(2) Some people who should, won't.
(3) Some people who shouldn't, will.
(4) Some people who can't, will try, regardless.
(5) Some people who shouldn't, but try, will then blame others.
-- People's Action Rules

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