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<b_jonas> `` gzip -dc share/mtg/All\\ Sets-2017-09-20.zip > share/mtg/allsets-2017-09-20.zip
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date Wed, 04 Oct 2017 11:30:07 +0000
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Lambek's Lemma, invented by Joachim "Taneb" Lambek, states that initial algebras have inverses. It can be proved with as few as five arrows.