k/t gallows reduplication

[Searcher]

The text is full of long sequences of ch, sh, o, r, d, etc. They are not so notable in the text, but it doesn't mean that their strings less significant. 

I should check ch/sh sequences. ch/sh are similar to k/t in probability of getting an existing word by replacing one with the other, especially for common words, which gives them a random-like quality. I don't understand what you mean by o, r, d.

o, r: 
f3r, line 15: tsheoarom  shor  or  chor  olchsy chom  otchom  oporar
o, r, a:
f15v, line 2: 3chor  or  oro  r aiin  cthy  tain  dar

d, o, a, r:
f5v, line 3: qotcho  ytor  daiin  daiin  otchor  daiin qo  dar chor  do

d, o:
f6v, line 4: y  shckhy  ytchoy  sos  y dady  dchy dey  okody  ytody
f7v, last line: sho  keeo  daiir  chokchy  dor  deol  dy  doldaiin

l, o, e, d:
f1v, line 7: qo  ol  choees  cheol  dol  cthey  ykol dol  dolo  ykol  do lchedy

(not counting y, ch, sh, t and the others)
It is a frequent phenomenon in the VMs when some lines contain words with a strictly limited group of characters, but, of course, it happens not in every line.
Or you meant something another?