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Proof step 3 from proof instore-inrefs-02 (previous step)

r ∈ st .refs ⊦ st = ∅, r ∈ st

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 2:
⊦ r ∈ st .refs ↔ r ∈ st

Rule argument

[crewrite-arg: refs-def, F, [st, r] → [st, r]]

Additional information

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