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Clark took his fight all the way to the Iowa Supreme Court where he won a ruling based on the Iowa Constitution of 1857 which states that the board of education is required to " provide for the education of all the youths of the State , through a system of common schools .
 Clark, Iowa, Iowa Constitution
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Clark, Iowa, Iowa Constitution