Change:
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Discussion:
extension contains a list of MLS ciphersuites that are supported by the client. <ins> These extensions MUST be always present in a ClientInitKey. </ins> 7.2. The "expiration" extension represents the time at which clients MUST

then it MUST consider the ClientInitKey invalid and not use it for any further processing. <del> Note that as an extension, it is not required that any given ClientInitKey have an expiration time.  In particular, applications that rely on "last resort" ClientInitKeys to ensure continued reachability may choose to omit the expiration extension from these keys, or give them much longer lifetimes than other ClientInitKeys. </del> <ins> Applications that rely on "last resort" ClientInitKeys MAY set the expiration to its maximum value even though this is NOT RECOMMENDED. It is RECOMMENDED to rotate last resort keys at a pace chosen by the application even though they can have much longer lifetimes than other ClientInitKeys. This extension MUST always be present in a ClientInitKey. </ins> 7.3.