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Proof step 1 from proof is_valid_ref-addobj (
previous step
)
⊦ is_valid_ref(str, r, st) ↔ ¬ ¬ (is_valid_ref(r, st) ∧ (is_obj(str, r, st) ∨ is_array(str, r, st)))
Lemma
is_valid_ref-def