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Proof step 4 from proof look-del (previous step)

⊦ r = r0, (st -- r)[r0 -- sk0] = st[r0 -- sk0]

User applied rule insert lemma

And obtained the following new goals

Rule argument

[LEMMAARG : deleteref, [r, st] → [r, st]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r, st)]]