And for everyone reading this at home, this is a perfect example of the medical difference between a "sign" that a Doctor sees,
and a "symptom" that the patient reports.
So, in our case, the out-of-square cutting was a symptom: some bad outcome that is caused by something. The cutting isn't
the actual error, but the correctness of the cut is being ruined by the underlying error.
On the other hand, a SIGN, as recorded in your med records by the Doctor, is something that his trained eyes and hands are
able to detect, that exposes the underlying nature of the problem. Or, in our case, knowing that going to the end, and
seeing if the two sides are different, is a SIGN of what the problem is, leading to a possible cure.
When diagnosing a machine, a painful knee, or any system, it's important to try and tell whether what you're seeing
is a symptom of the problem, or is a sign leading you toward a solution. "Watch for signs" I suppose would be the wisdom

.
See....learn something new everyday
Cheers!
Thom