typo, page 232, line 6, the 2nd `-' should be `+'

[lixilinx]

for version Oct 16, 2022

btw, noticing p(z|x,y) = p(z|x) is very helpful to make CEB intuitive, otherwise eq I(x;z|y) = I(x;z) - I(y;z) may be false.

[murphyk]

thanks, fixed