"Graph 1" details some explicit relationships between the objects of the diagram. For example, the arrow between the "agent" and "CAT:Elsie" depicts an example of an "is-a" relationship, as does the arrow between the "location" and the "MAT". The arrows between the gerund "SITTING" and the nouns "agent" and "location" express the diagram's basic relationship; ""agent is SITTING on location""; "Elsie" is an instance of "CAT".