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Zanthoxylum usambarense ( Engl . ) Kokwaro has traditionally been used for the treatment of malaria , upper respiratory tract infections , cough , rheumatism , tooth decay and sore gums in Kenya and other African countries .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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