(domainSubclass birthday 2 Day)	Mid-level-ontology.kif 24233-24233	The number 2 argument of birthday is a subclass of day
(domainSubclass daylightHoursInterval 2 Day)	Weather.kif 851-851	The number 2 argument of daylight hours interval is a subclass of day
(domainSubclass daylightHoursTotal 2 Day)	Weather.kif 861-861	The number 2 argument of daylight hours total is a subclass of day
(domainSubclass weddingAnniversary 2 Day)	Mid-level-ontology.kif 24192-24192	The number 2 argument of weddingAnniversary is a subclass of day

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Sigma version 3.0 is open source software produced by Articulate Software and its partners