Fiction is related to Literature. Literature can be used for Teacher. Teacher is related to Class. Poem can be used for Class. 
Cab is related to Passenger. Passenger is related to Aircraft. Aircraft can be used for Transport. 
Fiction <--RelatedTo--> Literature --UsedFor--> Teacher <--RelatedTo--> Class <--UsedFor-- Poem 
Cab <--RelatedTo--> Passenger <--RelatedTo--> Aircraft --UsedFor--> Transport 