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AIM OF THE STUDY : The main aim of this study was to identify , catalogue and document the large number of wild medicinal plants used in the M ' Sila region ( northern Algeria ) for the treatment of several human pathologies .
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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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