3.1.5 Processing Events and Sequencing Rules

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Message processing events and sequencing rules SHOULD<16> be as specified in [RFC8446], [RFC5246], [RFC5077], and [RFC7301].<17> If a client receives an extension type in ServerHello that it did not request in the associated ClientHello, it MAY<18> abort the handshake. There can be more than one extension of the same type.