Modern Itelmen has been heavily influenced by Russian lexically, phonologically and grammatically. The language is typologically aberrant and phonologically difficult. Vowel length is phonologically contrastive and so is phonemic. There is some syntactically and phonologically triggered variation in the form of numerals. Contextual specification is also used to account for phonologically conditioned suppletive allomorphy, using phonological contexts. The Catalan orthography is systematic and largely phonologically based. Vowels and consonants can be phonologically short or long. They are unaccented and thus phonologically dependent upon a nearby word. A number of languages use breathy voicing in a phonologically contrastive way. Pre-Indic palatalization of velars resulted in the variant form , which was initially phonologically conditioned. The next stage is the lexeme, which is phonologically specified. Akhmimic is phonologically the most archaic of the Coptic dialects. However, pro-drop languages allow those referential pronouns to be omitted, or be phonologically null. Generally, Old Frisian phonologically resembles Old English. A direct derivation from "jism" is phonologically unlikely.