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+<a id="dir-spec.txt-D"></a>
+
+# Inferring missing proto lines
+
+The directory authorities no longer allow versions of Tor before
+0.2.4.18-rc. But right now, there is no version of Tor in the consensus
+before 0.2.4.19. Therefore, we should disallow versions of Tor earlier
+than 0.2.4.19, so that we can have the protocol list for all current Tor
+versions include:
+
+Cons=1-2 Desc=1-2 DirCache=1 HSDir=1 HSIntro=3 HSRend=1-2 Link=1-4
+LinkAuth=1 Microdesc=1-2 Relay=1-2
+
+For Desc, Microdesc and Cons, Tor versions before 0.2.7.stable should be
+taken to only support version 1.