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“Administering an extraordinary knuckle-rap to his Washington Post colleague, Ricks writes that Woodward's "thorough but White House-centric" book reports that the president was settling on a surge by November 2006.”
“When he had shown the quiz he'd written to a programmed engineering tutor he had gotten the software equivalent of a knuckle-rap.”
“When I gave the speakers the knuckle-rap test, I could only detect the faintest pitch change near the woofer end of the cabinet.”
Looking for tweets for knuckle-rap.