Interestingly, when filtering for lines that contain at least two instances of rare bigrams and relatively close to one another, I only get this:
So, it looks like the one from the Rosettes that you gave at the example could be the weirdest of them all. The other one, which is ai{cky}y in the transliteration file, is more like aicky or aiIky in the MS. Still quite weird looking.
Code:
% cat rarebigrams.txt | perl -ne "print if /\(.{,10}\(/"
f46v.8,=Pt okeedchsy.qokeedy.chetedar.or.a( ic )k( yy )
fRos.14,@L0 ( dd )( ss )chxSo, it looks like the one from the Rosettes that you gave at the example could be the weirdest of them all. The other one, which is ai{cky}y in the transliteration file, is more like aicky or aiIky in the MS. Still quite weird looking.