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Proof step 1 from proof l-05 (conclusion)

⊦ (b ' + a ' + x).last = (a ' + x).last

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: lapp-01: ⊦ (x + a ' + y).last = (a ' + y).last;%a: ⊦ (x + y) + z = x + y + z; from specification list