Border is related to Coast. Coast is related to Cliff. Cliff is related to Edge. Edge is related to Know. 
Owe is related to Pay. Pay is related to Expense. Expense is related to Tax. 
Border <--RelatedTo--> Coast <--RelatedTo--> Cliff <--RelatedTo--> Edge <--RelatedTo--> Know 
Owe <--RelatedTo--> Pay <--RelatedTo--> Expense <--RelatedTo--> Tax 