Typo of Chapter 7

[Magentaize]

Since I am reading a photocopy in China, I am sorry that I don’t know the typo page.
The typo is located in the "Note" of subsection "Implementing a simple majority vote classifier".

the underlined part should be {1,2,3} likes the shown below.

[rasbt]

I agree, thanks for noting that. It will be fixed in the 3rd edition.