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Step * of Lemma ppcc-problem2

∀[es:EO]. ∀[e:E].  (False) supposing ((↑¬bfirst(e)) and (↑first(e)))
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Latex:
\mforall{}[es:EO].  \mforall{}[e:E].    (False)  supposing  ((\muparrow{}\mneg{}\msubb{}first(e))  and  (\muparrow{}first(e)))


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