DEFINITION wf3_getl_conf()
TYPE =
       b:B
         .i:nat
           .c1:C
             .d1:C
               .v:T
                 .getl i c1 (CHead d1 (Bind b) v)
                   g:G
                        .c2:C
                          .wf3 g c1 c2
                            w:T.(ty3 g d1 v w)(ex2 C λd2:C.getl i c2 (CHead d2 (Bind b) v) λd2:C.wf3 g d1 d2)
BODY =
Show proof