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Tracing Paths

         

In the graph above, is it possible to trace a path from node 4 to node 6?

In the graph above, is is possible to trace a path from node 5 to node 4 that uses 3 or fewer edges?

How many paths that do not repeat a node of length at most 4 (having at most four edges) are there between node number 4 and node number 8?

How many distinct paths of length 4 (paths using 4 edges) that do not visit the same node more than once are there between node 0 and node 1?

How many paths are there between node number 9 and node number 7?

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