There's always one more.
The likelihood that you will spot an error in a recent contribution immediately
after correcting a different error in it is directly proportional to how boneheaded or inept the first error was to begin with. Basically, the History page is going to end up looking like
you're insane.
Corollary: The less like standard English the contribution looks, the less likely you are to find all its problems in one edit pass.
