> Cyrillic has letters for both sh and ch. (With the one for sh, ш, having been borrowed from the Hebrew for sh/s/th, ש.) And yet there have been some ligatur

> Cyrillic has letters for both sh and ch. (With the one for sh, ш, having been borrowed from the Hebrew for sh/s/th, ש.) And yet there have been some ligatures converted into letters following sound changes, as in ЪІ > Ы for [ɨ] (in Russian and Belarusian) or ІО > Ю for [ʉ] (in Bulgarian, Russian, Ukrainian, and Belarusian).