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Proof step 2 from proof prefix-same-01 (previous step)

x = y + a ' + z ⊦ y + a ' ⊑ x

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: prefix-same: ⊦ x + a ' ⊑ x + a ' + y;%a: ⊦ (x + y) + z = x + y + z; from specification list