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Proof step 1 from proof sorted-shift-left (conclusion)

n ≤ nused, nused < # zbrar, sorted(zbrar, 0, nused + 1) ⊦ sorted(shl(zbrar, n, nused + 1), 0, nused)

System applied rule normalize

And obtained the following new goals

Proof step 2:
nused < # zbrar, sorted(zbrar, 0, nused + 1), n ≤ nused ⊦ sorted(shl(zbrar, n, nused + 1), 0, nused)

Rule argument

Additional information