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appearance as argument number 1

(documentation AirFilter EnglishLanguage "An air filter is designed to remove Solid impurities from Air.")	Cars.kif 940-941
(subclass AirFilter Filter)	Cars.kif 938-938	Air filter is a subclass of filter

appearance as argument number 2

(termFormat EnglishLanguage AirFilter "air filter")

Cars.kif 939-939

antecedent

(=>
    (instance ?FILTER AirFilter)
    (hasPurpose ?FILTER
        (exists (?REMOVE ?AIR ?NONAIR ?MIX)
            (and
                (instance ?REMOVE Removing)
                (part ?AIR ?MIX)
                (instance ?AIR Air)
                (not
                    (instance ?NONAIR Air))
                (attribute ?NONAIR Solid)
                (patient ?REMOVE ?NONAIR)
                (part ?NONAIR ?MIX)
                (origin ?REMOVE ?MIX)
                (instance ?MIX Mixture)
                (instrument ?REMOVE ?FILTER)))))

Cars.kif 943-958

If a physical is an instance of air filter,
then the physical has the purpose there exist an entity, another entity,, , a third entity and a fourth entity such that the entity is an instance of removing and the other entity is a part of the fourth entity and the other entity is an instance of air and the third entity is not an instance of air and solid is an attribute of the third entity and the third entity is a patient of the entity and the third entity is a part of the fourth entity and the entity originates at the fourth entity and the fourth entity is an instance of mixture and the physical is an instrument for the entity

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