Traces of a wheel or similar

[takrobat]

Agreed about q being hub, and new tests shows that you are right to question this. 


This shows drift vs circulation. 
Drift is found by switching line starts between paragraphs, line 2 - midlines and last line switched separately. This is because we already know that d often is second line, and q is later line. The result is average over 1000 switches.
Circulation is what is left as a connection to the line above.