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Brb, randomly replacing references to IETF RFCs with references to the correspondingly-numbered @xkcd comics.
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"The key words 'MUST', 'MUST NOT', 'SHALL', 'SHALL NOT', 'REQUIRED', and 'OPTIONAL' in this document are to be interpreted as described in RFC 2119[1]." [1] xkcd.com/2119/
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cf. RFC 6919 rfc-editor.org/rfc/rfc6919
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