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Therefore , although this work chiefly constitutes an argument for the normative value and authentic character of the early Khildfah , nonetheless the author in expatiating on this argument , has also delved deep in explaining the conceptual framework of the institution of khildfah in Islam .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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