As for the VM data, the full transcriptions do show some repeats of 4-word strings and higher. I suspect this is because of one of the messier parts of the transcription, like "o o o o o o o" or something along those lines. The isolated sections (Herbal A, Q13...) do correctly give no hits of strings longer than 3 words. So it's better to focus on those.
If I take Q13 and sort by the amount of repeated 3-word strings, I have 12 non-VM texts who
- repeat fewer 3-word strings than Q13
- repeat no 4-word strings
In the table, 1 means "no repeats over 1000-word window"
If I take Q13 and sort by the amount of repeated 3-word strings, I have 12 non-VM texts who
- repeat fewer 3-word strings than Q13
- repeat no 4-word strings
In the table, 1 means "no repeats over 1000-word window"

