Step 
*
 of Lemma 
trivial-cube-set_wf
() ∈ CubicalSet
BY
 
{ (Unfold `trivial-cube-set` 0 THEN MemTypeCD THEN Reduce 0 THEN Auto) }
 
Latex: 
Latex:
()  \mmember{}  CubicalSet
 By 
Latex:
(Unfold  `trivial-cube-set`  0  THEN  MemTypeCD  THEN  Reduce  0  THEN  Auto)
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