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Step * of Lemma comb_for_before_wf

λa,ps,u,z. before(u;ps) ∈ a:DSet ⟶ ps:(|a| List) ⟶ u:|a| ⟶ (↓True) ⟶ 𝔹
BY
{ ProveOpCombTyping `before_wf` }

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Latex:

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Latex:
\mlambda{}a,ps,u,z.  before(u;ps)  \mmember{}  a:DSet  {}\mrightarrow{}  ps:(|a|  List)  {}\mrightarrow{}  u:|a|  {}\mrightarrow{}  (\mdownarrow{}True)  {}\mrightarrow{}  \mBbbB{}


By

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Latex:
ProveOpCombTyping  `before\_wf`

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