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Theorem disjoint-forward-field

⊦ r ∈ refs ∧ r1 ∈ refs ∧ r ≠ r1 ∧ ¬ junkref(str, r1, st) ∧ ¬ disjoint(str, (refs -l r1) + st[r1 -- sk '] .refval, st) ∧ sk ∈ instfields(st[r1 -- _type] .type .class) ∧ r1 ≠ jvmref ∧ is_classtype(st[r1 -- _type] .type) → ¬ disjoint(str, refs, st)

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