Lemma magic a b c d ec e :
ClosedSIND(Rule:=Rule) [a > b > c |- [d @@ (ec :: e)]] ->
ClosedSIND(Rule:=Rule) [a > b > pcf_vars ec c @@@ (ec :: nil) |- [d @@ (ec :: nil)]].
Lemma magic a b c d ec e :
ClosedSIND(Rule:=Rule) [a > b > c |- [d @@ (ec :: e)]] ->
ClosedSIND(Rule:=Rule) [a > b > pcf_vars ec c @@@ (ec :: nil) |- [d @@ (ec :: nil)]].