1) internal language services (translation Intralingual) is the same type of language services including rephrase or paraphrase (rewording and paraphrasing).
2) inter-language services (Interlingual translation) is a type of translation from one language to another language .
3) Services associated symbols (Intersemiotic translation) is the sign language translation to sign language from non-language text to film.
According to the most common understanding of translation, only the second type of service two types of translation is "illegitimate".
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