How to install in the diagram "Diagram between diagrams" between the classes "People" and "Car", as in this picture:
For example, when I just create a relationship between two classes, I get a one-to-one relationship, when I create a Cars property with a List type, and then use the "Show as Collection Association", I get the error message "Can't show as an association, because that the List cannot be found ... "how to make a one-to-many relationship?
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