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The Spotted Bush Snake ( Philothamnus semivariegatus ) is a non - venomous snake in the family Colubridae , distributed from South Africa to Sudan and Guinea .
 South Africa, Sudan, Guinea
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 South Africa, Sudan, Guinea