Sum is a type of Whole. Whole is related to Bunch. 
Recall is a synonym of Think. Think is related to Opinion. Opinion is related to Perspective. Painting requires Perspective. 
Sum --IsA--> Whole <--RelatedTo--> Bunch 
Recall <--Synonym--> Think <--RelatedTo--> Opinion <--RelatedTo--> Perspective <--HasPrerequisite-- Painting 