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Challenge-based learning ( CBL ) is a pedagogic approach for K12 education pioneered by education staff at Apple , Inc. that has its roots in problem-based learning and the work of John Dewey .
 Apple , Inc., John Dewey
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Apple , Inc., John Dewey