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In the late 6th century AD , a relatively uniform intertribal " poetic koine " distinct from the spoken vernaculars developed based on the Bedouin dialects of Najd , probably in connection with the court of al-Ḥīra .
 Najd, al-Ḥīra
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Najd, al-Ḥīra