In a blunder being attributed to 'clerical oversight,' the Chicago ad agency of Meacham & Braun accidentally kept the rsum of recent University of Illinois graduate Chris DiMaio on file Monday. 'We regret the inadvertent fulfillment of our promise to Mr. DiMaio to retain his rsum for future reference should a position that suits him become available at Meacham & Braun,' said agency director Thomas Graydon. 'As a result of this error, we are investigating our rsum-processing system and are confident that future rsums remitted to us, with the exception of those few that impress us, will be disposed of surreptitiously while we pacify the applicant with platitudes.' 