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Step * of Lemma es-first_wf2

∀[es:EO]. ∀[e:E].  (first(e) ∈ 𝔹)
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Latex:

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Latex:
\mforall{}[es:EO].  \mforall{}[e:E].    (first(e)  \mmember{}  \mBbbB{})


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