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erDiagram Employees { int EmployeeID string LastName string FirstName string Grade } EmployeeContacts { string PhoneNumber int EmployeeID } Projects { string ProjectID int CustomerID string Manager } Customers { int CustomerID string Customer } Schedules { int ProjectID int EmployeeID string Date int Hour } Employees ||..|{ EmployeeContacts : has Employees ||--|{ Schedules : has Projects }|--|| Customers : "" Projects ||--|{ Schedules : ""