Step 
*
 of Lemma 
Message_wf
∀[f:Name ─→ Type]. (Message(f) ∈ Type)
BY
 
{ ProveWfLemma }
 
Latex: 
Latex:
\mforall{}[f:Name  {}\mrightarrow{}  Type].  (Message(f)  \mmember{}  Type)
 By 
Latex:
ProveWfLemma
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