DEFINITION wf3_pr3_conf()
TYPE =
       ∀g:G.∀c1:C.∀t1:T.∀t2:T.(pr3 c1 t1 t2)→∀c2:C.(wf3 g c1 c2)→∀u:T.(ty3 g c1 t1 u)→(pr3 c2 t1 t2)
BODY =
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