SECTION 3 LESSON 3

B. Each employee may be assigned to one and only one department.
Each department may be responsible for one or more employees.

Each person must be born in one and only one town.
Each town may be the birthplace of one or more persons.

Each person must be living in one and only one town.
Each town may the hometown of one or more persons.

Each person may be the visitor of one or more towns.
Each town may be visited by one or more persons.

Each person may be the mayor of one and only one town.
Each town must be governed by one and only one person.