In our previous experiment, we originally formulated 103 unique diachronically-based orthographic correspondences for CS-PL and 77 unique correspondences for BG-RU, including equal-to-equal correspondences (e.g., (y:y), (u:u) ).
only 48 correspondences were applied on parallel word lists for the BG-RU mapping, and 81 for the CS-PL mapping.