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5.5.2. Why decisions were made

To get further insight into the "why", it gets user-unfriendly very quickly. If you add the --show-scores option, you will also see all the scores that went into the decision-making. The node with the highest cumulative score for a resource will run it. You can look for -INFINITY scores in particular to see where complete bans came into effect.
You can also add -VVVV to get more detailed messages about what’s happening under the hood. You can add up to two more V’s even, but that’s usually useful only if you’re a masochist or tracing through the source code.