Context: Phonetically in some languages, such as Navajo, aspiration of stops tends to be realised as voiceless velar airflow; aspiration of affricates is realised as an extended length of the frication.

Question: Aspiration of stops is seen as voiceless velar airflow in some languages, such as what?
Answer: Navajo

Question: In Navajo, the aspiration of affricates can be seen as what?
Answer: an extended length of the frication

Question: What is realized as an extended length of the airflow?
Answer: Unanswerable

Question: In what language does the unaspiration of stops tend to be realized as voiceless velar airflow?
Answer: Unanswerable

Question: What is realized as voiced velar airflow?
Answer: Unanswerable

Question: In what language does voiceless velar airflow not exist?
Answer: Unanswerable

Question: Aspiration of airflow is realized as what?
Answer: Unanswerable