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How would you model this situation with a UML class diagram? One project may consist of several other projects. The Chegg expert said that the

How would you model this situation with a UML class diagram?

"One project may consist of several other projects."

The Chegg expert said that the answer is d

),

now my question is about the difference between the black and white arrows, and what it means to have

1 . . . *

in each extreme of the arrow.

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