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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 ) .
 person: Fred Wendorf; person: Christopher Ehret
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Fred Wendorf, Christopher Ehret 
Answer:
 person: Fred Wendorf; person: Christopher Ehret