Step 
*
 of Lemma 
treeco_size_wf
∀[E:Type]. ∀[p:treeco(E)].  (treeco_size(p) ∈ partial(ℕ))
BY
 
{ ProveCoSizeWf }
 
Latex: 
Latex:
\mforall{}[E:Type].  \mforall{}[p:treeco(E)].    (treeco\_size(p)  \mmember{}  partial(\mBbbN{}))
 By 
Latex:
ProveCoSizeWf
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