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Proof step 3 from proof at-put-first-rec-04 (conclusion)

str ≠ str0 ⊦ (st[r -- mkfs(class, ty, ((* str)) .field) ', val][r0 -- (mkfs(class0, ty0, str0 .field) ' ' + sk1 ' + sks)]) = (st[r -- mkfs(class, ty, str .field) ', val][st[r0 -- mkfs(class0, ty0, str0 .field) '] .refval -- (sk1 ' + sks)])

Special step normalize

And obtained the following new goals

Proof step 2:
str ≠ str0 ⊦ (st[r -- mkfs(class, ty, str .field) ', val][r0 -- (mkfs(class0, ty0, str0 .field) ' ' + sk1 ' + sks)]) = (st[r -- mkfs(class, ty, str .field) ', val][st[r0 -- mkfs(class0, ty0, str0 .field) '] .refval -- (sk1 ' + sks)])