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Step * 1 of Lemma singleton-contraction_wf2

.....assertion..... 
1. X : CubicalSet{j}
2. T : {X ⊢ _}
3. a : {X ⊢ _:T}
4. s : {X ⊢ _:Singleton(a)}
⊢ singleton-contraction(X;s.2) ∈ {X ⊢ _:(Path_Singleton(a) singleton-center(X;a) cubical-pair(s.1;s.2))}
BY
{ (All (Unfolds ``singleton-type singleton-center``) THEN Auto) }

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Latex:

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Latex:
.....assertion..... 
1.  X  :  CubicalSet\{j\}
2.  T  :  \{X  \mvdash{}  \_\}
3.  a  :  \{X  \mvdash{}  \_:T\}
4.  s  :  \{X  \mvdash{}  \_:Singleton(a)\}
\mvdash{}  singleton-contraction(X;s.2)  \mmember{}  \{X  \mvdash{}  \_:(Path\_Singleton(a)  singleton-center(X;a)
                                                                                            cubical-pair(s.1;s.2))\}


By

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Latex:
(All  (Unfolds  ``singleton-type  singleton-center``)  THEN  Auto)

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