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Reportneed to know the type ofVehicle? Sounds like maybe theVehiclecould have a method toGenerateReportif that knowledge is truly needed.Reportwould have aVehicleID. There would be a service calledReportProcessorwhich takes reports and processes them.ReportProcessorneeds know what type of vehicle the report is for. If we keepReportgeneric thenReportProcessorhas to fetch theVehicleto check what type it is.