Chief is related to American. American is related to Constitution. Constitutional is derived from Constitution. 
Bed is related to Lie. one thing you do when you Lie is Injury. Strain is a type of Injury. 
Chief <--RelatedTo--> American <--RelatedTo--> Constitution <--DerivedFrom-- Constitutional 
Bed <--RelatedTo--> Lie --HasSubevent--> Injury <--IsA-- Strain 