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Proof step 1 from proof from-to-rest (conclusion)

⊦ # buf = n + m → (⌜buf⌝ from n) to m = ⌜buf⌝ from n

System applied rule normalize

And obtained the following new goals

Proof step 2:
# buf = n + m ⊦ (⌜buf⌝ from n) to m = ⌜buf⌝ from n

Rule argument

Additional information