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multiplicity pattern comparison table

Subject	be	have example
many-to-many	as general as possible	A secretary can work for many managers, and a manager can have many secretaries
many-to-one	the same as one-to-many	A company has many employees, but an employee can only work for one company
one-to-many	the same as many-to-one
one-to-one	less common than other multiplicity patterns	For each company, there is exactly one board of directors

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