Step 
*
 of Lemma 
I-face_wf
∀[X:CubicalSet]. ∀[I:Cname List].  (I-face(X;I) ∈ Type)
BY
 
{ ProveWfLemma }
 
Latex: 
Latex:
\mforall{}[X:CubicalSet].  \mforall{}[I:Cname  List].    (I-face(X;I)  \mmember{}  Type)
 By 
Latex:
ProveWfLemma
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