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Proof step 16 from proof cyclic-put-statfield-01 (previous step)

dups(refs), validrefs(str, refs, st[refs .first -- _type] .type, st) ⊦ cyclic(str, refs .first, st[jvmref -- sk, val])

Heuristic elimination applied rule insert elim lemma

And obtained the following new goals

Proof step 15:
refs = r + refs0 ∧ refs ≠ [], dups(refs), validrefs(str, refs, st[r -- _type] .type, st) ⊦ cyclic(str, r, st[jvmref -- sk, val])

Rule argument

[speclemmaarg: refs ≠ [] ,r = refs .first ∧ refs0 = refs .rest ↔ refs = r + refs0 ,[refs, r, refs0] → [refs, r, refs0] ,T ,list-data ,references ,elim-list-c ]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ dups([])], [CSIMPELIM : refs ≠ [] ⊦ r = refs .first ∧ refs0 = refs .rest ↔ refs = r + refs0])], [EXTRATERMS : (refs, r, refs0)]]