The last paragraph on p.55 may be confusing to some readers, and so should be reviewed. Perhaps the last sentence could be re-written as follows:

``Even experienced programmers find that forgetting while-loop initializers and incrementers is a frequent source of errore.''

Fixed error in sample sentence:

``Even experienced programmers find that forgetting while-loop initializers and incrementers is a frequent source of errors.''

The change for this is done now.