grep help

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http://www.unix.com – Hi I am in doubt over how to use grep here, The scenario is like, I have list of files and from then around 30 files contain the string "CE_" and from those 30 around 20 files contain the word "metc". I need to find out the list of those 10 files which doesn't contain the word metc but "CE_" Thanks is advance. (HowTos)