In a classroom of 27 students, 11 students have a blue pen, 12 students have a red pen, 7 students carry both a blue pen and pencil, 5 students carry a pencil and a red pen, 4 students carry 2 pens - one red and one blue, 2 students come prepared with one of each type of writing utensil, and 3 students consistently come to class with nothing to write with on paper and borrow from their study buddy. How many students carry only a pencil?

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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.