Skin is related to Seal. Machine can be used for Seal. Motor is a type of Machine. Motor is related to Starter. 
Threat is related to Danger. Danger is related to Concept. Fact is a type of Concept. Fact is related to Actual. 
Skin <--RelatedTo--> Seal <--UsedFor-- Machine <--IsA-- Motor <--RelatedTo--> Starter 
Threat <--RelatedTo--> Danger <--RelatedTo--> Concept <--IsA-- Fact <--RelatedTo--> Actual 