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Proof step 1 from proof ubifs-dir-data (conclusion)

⊦ fs[ri[inodekey(ino)]].directory ∧ ri[inodekey(ino)] ∈ ri ∧ ubifs-cons(fs, ri, ro, fi, fo, log) → datakeys(inodekey(ino), ri) = ∅

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information