[ahi]

Due to the number of error-prone editions both online and in print, I recommend people submit an edition they plan to purchase or read to a simple test:

What is the last sentence of the last paragraph of the last chapter (i.e.: Chapter 13, Paragraph 27)?

If it reads something like, "Spies are a most important element in war, because on them depends an army's ability to move." you have a reasonably proofread edition.

If, however, it reads, "Spies are a most important element in water, because on them depends an army's ability to move." you have a not so well proofread one.

Sun Tzu never implied spies have significant aquatic uses.

- Ahi