Typo on page 280

[mgul999]

Step 2 of the simulator in the proof of Zero Knowledge for ZK-QR says "Pick 𝑠″ at random in ℤ∗_m. If 𝑏 = 0 then let 𝑥′ = 𝑠″2 (mod 𝑚).Otherwise output 𝑥′ = 𝑥𝑠″2 (mod 𝑚)." I believe it's supposed to be b' instead of b here, since b' is defined in the previous step, but b is not defined until the next step.