| ⊦ n ≤ nused ∧ nused < # zbrar ∧ sorted(zbrar, 0, nused + 1) → keys(shl(zbrar, n, nused + 1), 0, nused) = keys(zbrar, 0, nused + 1) -- zbrar[n].key |
nused < # zbrar, sorted(zbrar, 0, nused + 1), n ≤ nused ⊦ keys(shl(zbrar, n, nused + 1), 0, nused) = keys(zbrar, 0, nused + 1) -- zbrar[n].key