The NOTIN operator work perfectly, I have tried it my self. Also it is mentionned in the SAS Support that NOT is a prefix wich can be used with other operators. "A prefix operator is an operator that is applied to the variable, constant, function, or parenthetic expression that immediately follows it. The plus sign (+) and minus sign (-) can be used as prefix operators. The word NOT and its equivalent symbols are also prefix operators" Source: http://support.sas.com/documentation/cdl/en/lrcon/62955/HTML/default/viewer.htm#a000780367.htm
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