Among the BG-RU correspondences that the model suggested are the following correspondences of noun endings, sorted by frequency upon discovery 7 (iteration in brackets): e.g., (а#:а#) 149 (12) (for feminine); (я#:я#) 40 (38) (for feminine); (о#:о#) 36 (45) (for neuter) etc.
the last ending is ambiguous and may also be an adverb ending, for example, BG-RU:много -много (mnogo -mnogo) 'a lot of'.