Question: The figure below is called a graph. The circles are called nodes and the lines are called edges. An edge connects two nodes. You can

The figure below 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 haunted house containing rooms and passages between rooms. The nodes can be thought of as rooms and an edge connects one room to another. Note that each node could have, at most, four edges.

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