People is related to Society. Society is related to Class. 
Back is a synonym of Endorse. Endorse is a type of Sign. Sign is related to Danger. Danger is related to Concept. 
People <--RelatedTo--> Society <--RelatedTo--> Class 
Back <--Synonym--> Endorse --IsA--> Sign <--RelatedTo--> Danger <--RelatedTo--> Concept 