,------------------------.               
                 |ICreditCard             |               
                 |------------------------|               
                 |+ GetCardType(): string |               
                 |+ GetCreditLimit(): int |               
                 |+ GetAnnualCharge(): int|               
                 `------------------------'               
                                                          
                                                          
                                ,------------------------.
,----------------------------.  |MoneyBack               |
|Program                     |  |------------------------|
|----------------------------|--|+ GetCardType(): string |
|+ Main(args: string[]): void|  |+ GetCreditLimit(): int |
`----------------------------'  |+ GetAnnualCharge(): int|
                                `------------------------'