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Proof step 1 from proof validrefs-applast-array-null (
previous step
)
⊦ validrefs(str, refs, ty, st) ∧ validrefs(str, refs0, ty0, st) ∧ refs .last = refs0 .first ∧ refs ≠ [] ∧ refs0 ≠ [] → validrefs(str, refs + refs0 .rest, ty, st)
Lemma
validrefs-append-01