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HOW TO PROVE IT, PART 7 proof by forward reference: Reference is usually to a forthcoming paper of the author, which is often not as forthcoming as at first. proof by semantic shift: Some of the standard but inconvenient definitions are changed for the statement of the result. proof by appeal to intuition: Cloud-shaped drawings frequently help here.
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/\ ___ /\ // \/ \/ \\ (( O O )) \\ / \ // \/ | | \/ | | | | | | | | | o | | | | | |m| |m|
find /usr/bin ! -user root