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participant E as Email System C->>BM: Selects products BM->>BM: Scans products at till BM-->>C: Gives total cost BM->>C: Asks for email address C->>BM: Provides email address C->>BM: Pays with cash/card BM->>E: Sends receipt to email E-->>C: Emails receipt BM->>C: Gives 10% off next order If we