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Step * 2 of Lemma nil_wf

.....set predicate..... 
1. T : Type
⊢ (colength([]))↓
BY
{ (RepUR ``colength nil`` 0 THEN Auto) }

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Latex:

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Latex:
.....set  predicate..... 
1.  T  :  Type
\mvdash{}  (colength([]))\mdownarrow{}


By

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Latex:
(RepUR  ``colength  nil``  0  THEN  Auto)

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