We will take the common example of Customer, Transactions and the Tender used in the Transactions. Here we have two implied relationships: Customer may use a Tender (mode of payment e.g. Credit Card, Gift Card etc); A Tender (mode of payment) can be used by Customer Here the the relationship is bi-directional with different context. Note that Customer may use several different Tenders in different transactions e.g. The Customer may use a Gift Card for Transaction 1 and Credit Card for Transac...