Step 
*
 of Lemma 
pircv_wf
∀[chan,var:Name].  (pircv(chan;var) ∈ pi_prefix())
BY
 
{ DepprodCoDatatypeConstructorWf `pi_prefix_size` }
 
Latex: 
Latex:
\mforall{}[chan,var:Name].    (pircv(chan;var)  \mmember{}  pi\_prefix())
 By 
Latex:
DepprodCoDatatypeConstructorWf  `pi\_prefix\_size`
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