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+  o Major features (directory mirrors):
+    - Include an opt-in trial list of Default Fallback Directories in
+      add_default_fallback_dir_servers().
+      "Tor has included a feature to fetch the initial consensus from nodes
+       other than the authorities for a while now. We just haven't shipped a
+       list of alternate locations for clients to go to yet.
+       Reasons why we might want to ship tor with a list of additional places
+       where clients can find the consensus is that it makes authority
+       reachability and BW less important.
+       We want them to have been around and using their current key, address,
+       and port for a while now (120 days), and have been running, a guard,
+       and a v2 directory mirror for most of that time."
+      We exclude BadExits and tor versions that aren't recommended.
+      We include an IPv6 address for each FallbackDir (#8374).
+      (Tor might not use IPv6 fallbacks until #6027 is merged.)
+      The unit test ensures that we successfully load all included
+      default fallback directories.
+      Closes ticket #15775. Patch by "teor".
+      OnionOO script by "weasel", "teor", "gsathya", and "karsten".