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The Tibesti-Jebel Uweinat montane xeric woodlands ecoregion , in the deserts and xeric shrublands biome , is located in in the eastern Sahara The woodlands ecoregion occupy two separate highland regions , covering portions of northern Chad , southwestern Egypt , southern Libya , and northwestern Sudan .
 Chad, Egypt, Libya, Sudan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Chad, Egypt, Libya, Sudan