Delivery is related to Rush. Rush is related to Quick. Quick is related to Speed. Speed can be Dangerous. 
Size is a type of Situation. Size is related to Bed. Bed is related to Sofa. Sofa can be used for Comfort. 
Delivery <--RelatedTo--> Rush <--RelatedTo--> Quick <--RelatedTo--> Speed --HasProperty--> Dangerous 
Situation <--IsA-- Size <--RelatedTo--> Bed <--RelatedTo--> Sofa --UsedFor--> Comfort 