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Proof step 23 from proof in-put (previous step)

⊦ rk ∈ st[r -- sks, val] ↔ rk ∈ st ∨ rk = st[r -- sks .butlast] .refval -- sks .last, # sks = 1, sks = []

User applied rule structural induction

And obtained the following new goals

Proof step 22:
⊦ r0 -- sk ∈ st[r -- sks, val] ↔ r0 -- sk ∈ st ∨ r0 -- sk = st[r -- sks .butlast] .refval -- sks .last, # sks = 1, sks = []

Rule argument

[VARWITHVARSEQSARG : rk, ()]

Additional information

[[CONCRETESIMPRULES : ([CSIMPGEN : refkey generated by --;])]]