If I understand David correctly he only has one point for Currier A and one point for Currier B. One point is not enough to decide if the number of new words decreases over time.
It is known that the text in the VMS is changing from Currier A to Currier B. Therefore Schinner is probably correct and the number of new words didn't decrease for additional text as expected.
It is known that the text in the VMS is changing from Currier A to Currier B. Therefore Schinner is probably correct and the number of new words didn't decrease for additional text as expected.

