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Proof step 1 from proof byte-011x-pos-02 (conclusion)
0 ≤ i, i < 128 ⊦ band(b2i(by), 255) = (* i) ↔ b2i(by) = i
Special step normalize
And obtained the following new goals
Proof step 2
:
0 ≤ i, i < 128 ⊦ band(b2i(by), 255) = i ↔ b2i(by) = i