Rider is a type of Traveler. Rider is related to Horse. Horse is related to Hair. Hair is related to Grass. 
Aware is related to Realize. Express is a type of Realize. Express is related to Driving. 
Traveler <--IsA-- Rider <--RelatedTo--> Horse <--RelatedTo--> Hair <--RelatedTo--> Grass 
Aware <--RelatedTo--> Realize <--IsA-- Express <--RelatedTo--> Driving 