Ahh, that's a little gem that future hunters will only be able to find if they read the supplementary information that accompanied the revised regulation in the Federal Register. Actually, it's not even there. It's in a footnote:
38 For the purposes of this guidance, a year is defined as any consecutive twelve month period.
Lousy place to put stuff people might actually need to know.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.