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WITH RECURSIVE po (DEPT_NO, DEPARTMENT) AS ( SELECT D.DEPT_NO, D.DEPARTMENT FROM DEPARTMENT D INNER JOIN EMPLOYEE E ON D.MNGR_NO = E.EMP_NO WHERE E.FIRST_NAME = 'Robert' AND E.LAST_NAME = 'Nelson' UNION ALL SELECT D.DEPT_NO, D.DEPARTMENT FROM DEPARTMENT D INNER JOIN po ON D.HEAD_DEPT = po.DEPT_NO ) SELECT DEPT_NO, DEPARTMENT FROM po

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