A key to understand the VMS

[Sam G]

For the most frequently used word daiin it is possible to build a tree of similar words starting with o- or qo-. The frequencies for this words are very characteristic:

Level 1:                                          daiin (863 times)
Level 2:          okaiin (212 times)         |          otaiin (154)        |  odaiin (60)
Level 3: qokaiin (262 times), kaiin (65) | qotaiin ( 79), taiin (42) | qodaiin (42)
There are more words starting with ok- or ot- then with od- and the word starting with qok- is even more frequent then the word starting with ok.

So qokaiin is more common than okaiin, but otaiin is more common than qotaiin.  Why should this be true, from the standpoint of your auto-copying hypothesis?  If the scribe is just randomly adding a q in some cases, shouldn't the ratios be roughly equal?