Investigation is related to Case. Case is related to Work. Work is related to Go. Go is a synonym of Travel. 
Window is related to Air. Air is related to Component. Hardware is a type of Component. 
Investigation <--RelatedTo--> Case <--RelatedTo--> Work <--RelatedTo--> Go <--Synonym--> Travel 
Window <--RelatedTo--> Air <--RelatedTo--> Component <--IsA-- Hardware 