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Theorem abs-fold-del

⊦ str ∈ entries ∧ p ∈ tree ∧ tree[p] = dnode(md, sdt) ∧ ((abs|(tree, ROOT_INO, p, ino0) * ino0 => mkdir(# entries - 1, md, m0, m1, entries -- str) * abs(sdt -- str, entries -- str)))(dirs) → abs(tree -- (p + str '), ROOT_INO)(dirs)

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