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Proof step 3 from proof eqex-sym (previous step)

eqex(st, st0, r) ⊦ st0 -- r = st -- r

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

[crewrite-arg: eqex, F, [r, st0, st] → [r, st0, st]]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (r, st0, st)]]