Editing Old Church Slavonic (section)

===Phonotactics===
Several notable constraints on the distribution of the phonemes can be identified, mostly resulting from the tendencies occurring within the [[Common Slavic]] period, such as ''intrasyllabic synharmony'' and the ''law of open syllables''. For consonant and vowel clusters and sequences of a consonant and a vowel, the following constraints can be ascertained:<ref>{{Harvnb|Huntley|1993|pp=127–8}}.</ref>
* Two adjacent consonants tend not to share identical features of [[manner of articulation]]
* No syllable ends in a consonant
* Every obstruent agrees in voicing with the following obstruent
* Velars do not occur before front vowels
* Phonetically palatalized consonants do not occur before certain back vowels
* The back vowels /y/ and /ъ/ as well as front vowels other than /i/ do not occur word-initially: the two back vowels take prothetic /v/ and the front vowels prothetic /j/. Initial /a/ may take either prothetic consonant or none at all.
* Vowel sequences are attested in only one lexeme (''paǫčina'' 'spider's web') and in the suffixes /aa/ and /ěa/ of the imperfect
* At morpheme boundaries, the following vowel sequences occur: /ai/, /au/, /ao/, /oi/, /ou/, /oo/, /ěi/, /ěo/