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Proof step 1 from proof cyclic-addobj-other-01 (
previous step
)
⊦ ¬ cyclic(str, r, st) ∧ ¬ junkref(str, r, st) ∧ newref(r0, st) ∧ r ≠ r0 → ¬ cyclic(str, r, addobj(r0, class, fis, st))
Lemma
cyclic-addobj-other