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And what is testlog in this diagram is it attribute on relationship. Thanks

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To quote Wikipedia:

The UML representation of a composition relationship shows composition as a filled diamond shape on the containing class end of the lines that connect contained class(es) to the containing class.

In other words, a patient can have any number of accounts associated with (possessed by) it.

  • Thanks @mustaccio – Rapheal Oct 17 '19 at 4:08

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