Step
*
of Lemma
aa_ltree_wf
[T:Type]. (aa_ltree(T) 
 Type)
BY
{ Unfold `aa_ltree` 0 THEN Auto }
\mforall{}[T:Type].  (aa\_ltree(T)  \mmember{}  Type)
By
Unfold  `aa\_ltree`  0  THEN  Auto
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