Interjections are important part of the communication construction with their emotional and social functions. They express natural reaction or they arouse it.
     Arbitrary cluster of sounds may be used in text to express interjection using determinative oks (onomatopoeic interjections: hiss - ssioks) or noun (in vocative), exhortative or adverbs (interjections of contact and of challenge). Determinative oks can be used to emphasize word in the clause (along with the word order change - see this) or in exclamation clauses without the word order change.