Step 
*
 of Lemma 
loopset_wf
loopset() ∈ coSet{i:l}
BY
 
{ (ProveWfLemma THEN skip{BLemma `fix_wf_coSet`}) }
 
Latex: 
Latex:
loopset()  \mmember{}  coSet\{i:l\}
 By 
Latex:
(ProveWfLemma  THEN  skip\{BLemma  `fix\_wf\_coSet`\})
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