Chapter 13.1 incorrect statement about code in listing 13-6

[dariuswiles]

The paragraph below listing 13-6 in chapter 13.1 states:

Now the expensive calculation is called in only one place, and we’re only executing that code where we need the results.

This is incorrect because the expensive calculation is called in several places, as the next paragraph of the book explains. I believe the incorrect statement may have been intended to say:

Now the expensive calculation is defined in only one place, and we’re only executing that code where we need the results.

[carols10cents]

This was fixed in #2556. Thanks!