The vowel exchange "a" to "o"

[Petrasti]

I have again inserted the first four lines of slide You are not allowed to view links. Register or Login to view. with the change from a to o. Here, as already mentioned, I assume that a/y are synonymous.

We have about 30 words in the first 4 lines, 24 of which have a ‘partner’ with the swapped vowel in the manuscript. This cannot be explained by Japanese, Slovenian, German or Italian. The frequency of swapping is repeated in each slide, sometimes more or less, depending on how often a word occurs in the manuscript

kooiin  koaiin, cheo chey, pchor pchar, o y, dain doin, chor char, kcho  kchy, kchy kcho, c+ho  c+hy, c+hol  c+hal, qotcho qotchy, qoty  qoto, chor char, daiin doiin, otchy  otcho, chor  char, lc+hy  lc+ho, chol  char, chody  chodo,
chcthy chctho, daiin  doiin, c+ho  c+hy, cholo choly, cheor  chear,