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Fred Wendorf and Christopher Ehret have suggested that the people who occupied this region at that time were early pastoralists , or like the Saami practiced semi-pastoralism ( although this is disputed by other sources because the cattle remains found at Nabta have been shown to be morphologically wild in several studies , and nearby Saharan sites such as Uan Afada in Libya were penning wild Barbary sheep , an animal that was never domesticated ) .
 Fred Wendorf, Christopher Ehret
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fred Wendorf, Christopher Ehret