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How do you model the following situation with a UML2 class diagram: A doctor treats multiple patients, a patient can be treated by multiple doctors. To document which doctor has when treated which patient, the date and time of each treatment are stored. It has to be possible that a doctor treats the same patient multiple times. Doctor A Treatment date: Date time: Time Patient B Doctor Patient date: Date time: Time Doctor Treatment date: Date A Treatment date: Date time: Time Patient B Doctor Patient date: Date time: Time Doctor 1 Treatment date: Date time: Time Patient Doctor {non-unique) Treatment date: Date * {non-unique} time: Time Patient