3.16 A basic wooden railway set contains the pieces shown in Figure 3.32. The task is to connect these pieces into a railway that has no overlapping tracks and no loose ends where a train could run off onto the floor. Write a program to find an optimal solution. a. Suppose that the pieces fit together exactly with no slack. Give a precise formulation of the task as a search problem. b. Identify a suitable uninformed search algorithm for this task and explain your choice.

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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.