Consider the network below where the red arrows represent customer->provider peerings and the blue lines shared cost peerings. We consider different policies for the green line.
Provide your answer as a comma-separated list of paths starting with the preferred one. For example, the answer:
indicates that the AS has learned two different paths. The preferred one is the one via
AS9 that has a length of 2 AS hops while the second path has a length of 3 AS hops. If there is no path, return 0 as your answer.