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Nabta Playa was once a large basin in the Nubian Desert , located approximately 800 kilometers south of modern day Cairo or about 100 kilometers west of Abu Simbel in southern Egypt , 22 ° 32 ' north , 30 ° 42 ' east .
 Cairo, Egypt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cairo, Egypt