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versions 0.1.0.x; the protocol in this document only works with Tor
versions in the 0.1.1.x series and later.)
+ The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL
+ NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
+ "OPTIONAL" in this document are to be interpreted as described in
+ RFC 2119.
+
1. Protocol outline
TC is a bidirectional message-based protocol. It assumes an underlying