Sale is related to Purchase. Purchase is related to Insurance. Insurance is related to Progressive. 
Hearing is related to Case. Case is related to Carrier. Carrier is related to Blood. Blood is related to Force. 
Sale <--RelatedTo--> Purchase <--RelatedTo--> Insurance <--RelatedTo--> Progressive 
Hearing <--RelatedTo--> Case <--RelatedTo--> Carrier <--RelatedTo--> Blood <--RelatedTo--> Force 