Step 
*
 of Lemma 
bm_E_wf
∀[T,Key:Type].  (bm_E() ∈ binary_map(T;Key))
BY
 
{ DepprodCoDatatypeConstructorWf `binary_map_size` }
 
Latex: 
Latex:
\mforall{}[T,Key:Type].    (bm\_E()  \mmember{}  binary\_map(T;Key))
 By 
Latex:
DepprodCoDatatypeConstructorWf  `binary\_map\_size`
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