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Proof step 6 from proof range-rem-in (previous step)

ri-cons(ri, nodes(gstore, ginval)), key ∈ ri ⊦ adr ∈ ri -- key ↔ adr ≠ ri[key] ∧ adr ∈ ri

User applied rule case distinction

And obtained the following new goals

Rule argument

pos: right 1

Additional information