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While the focus of the Buddha 's teachings are about attaining the highest good of nirvana , they also contain an analysis of the source of human suffering , the nature of personal identity , and the process of acquiring knowledge about the world .
 person: Buddha
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Buddha