The following figure is called a graph. The circles are called nodes and the lines are called edges. An edge connects two nodes. You can interpret the graph as a maze of rooms and passages. The nodes can be thought of as rooms, and an edge connects one room to another. Note that each node has at most four edges in the graph that follows.

 

Write a program that implements the previous maze using references to instances of a Node class. Each node in the graph will correspond to an instance of Node. The edges correspond to links that connect one node to another and can be represented in Node as instance variables that reference another Node class. Start the user in node A. The user’s goal is to reach the finish in node L. The program should output possible moves in the north, south, east, or west direction. Sample execution is shown next.