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Proof step 2 from proof rm-vl-append-same (previous step)

⊦ [] + eq-entry(n, lref) ' - lref = [] - lref

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ eq-entry(n, lref) ' - lref = []

Rule argument

Additional information

Used simplifier rules: queue-rm-vl-base: ⊦ [] - lref = [];%a: ⊦ (q + q0) + q1 = q + q0 + q1; from specification list[erasequeue-base]% ⊦ [] + q = q; (s)