departments. Each department can offer any number of courses. Many instructors can work in a department but an instructor can work only in one department. For each department there is a head and an instructor can be head of only one department. Each instructor can take any number of courses and a course can be taken by only one instructor. A student can enroll for any number of courses and each course can have any number of students.

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Topological Sort

Topological sort is a sorting technique that sets up a hierarchy in a process. In this technique, when a directed network has nodes connected by arrows, the root node is placed before the successor node.