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Additional RFC 2119 terms
SHOULD+ Same as SHOULD. However, it is likely that an algorithm marked as SHOULD+ will be promoted at some future time to be a MUST.
MUST- Same as MUST for now. However, its expected that at some point in future this algorithm will no longer be a MUST
MAY+ - Same as MAY for now. However, its expected that this algorithm may get promoted at some future time to be a SHOULD.

PPT Version