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Graphics Interchange Format  |  1997-01-13  |  28.2 KB  |  448x222  |  4-bit (16 colors)
   ocr: (a) (b) Msg Bank msg_text sent by> Display interface Account Interface PIN Validate PIN Figure 10: (a) à Object modelfor. Ask Display to Display a Request for Amount; (b) object modelfor. Bank Validates PIN.