Coal is related to Heat. Heat is related to Flame. Flame is a type of Fire. Fire can be Essential. 
Branch is related to Government. Government is related to Political. Political is related to Treaty. 
Coal <--RelatedTo--> Heat <--RelatedTo--> Flame --IsA--> Fire --HasProperty--> Essential 
Branch <--RelatedTo--> Government <--RelatedTo--> Political <--RelatedTo--> Treaty 