JESS: defquery question

[Jeremic Zoran]

Hi, I have a simple question for you: I have already write find-questions query that works fine, but I need to add some statement that will evolve it to match only those questions whose ID is not equals to any already passed_question ID. ;;---- QUESTION TEMPLATE---;; (deftemplate question (slot conceptID (type INTEGER)) (slot ID (type INTEGER)) (slot group (type INTEGER)) (slot difficultyLevel (type INTEGER))) ;;---- PASSEDD QUESTION TEMPLATE---;; (deftemplate passed_question (slot ID (type INTEGER)))   ;;--- DEFQUERY FIND-QUESTIONS ---;; ;;---FIND ALL QUESTIONS IN ONE GROUP---;; ;;--- THAT MATCH CURRENT CONCEPT, DIFFICULTY LEVEL ---;; ;;--- AND IS NOT ALREADY PASSEDD ---;;   (defquery find-questions (declare (variables ?currConc ?group ?diffLev)) (question (conceptID ?a&: (eq ?a ?currConc)) (group ?b&: (eq ?b ?group)) (difficultyLevel ?c&: (eq ?c ?diffLev)) ) ) Could you help me to solve this problem? Thanks.