| ∀ n. n ∈ of0 → of0[n].ino ∈ files0, ∀ n. (n ∈ of0 → of0[n].ino ∈ files0) → n ∈ of1 → of1[n].ino ∈ files1 ⊦ ∀ n. n ∈ of1 → of1[n].ino ∈ files1 |
n ∈ of1, ∀ n. (n ∈ of0 → of0[n].ino ∈ files0) → n ∈ of1 → of1[n].ino ∈ files1, ∀ n. n ∈ of0 → of0[n].ino ∈ files0 ⊦ of1[n].ino ∈ files1