when were the common core standards adopted
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when were the common core standards adopted
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who established common core state standards
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when were the common core standards adopted, when were common core state standards adopted, history of the common core state standards, common core standards history, who developed the common core standards, who created the common core standards, when was the common core created, when was common core implemented, when was common core introduced, who established common core state standards, when was common core established, common core us history standards, what year was common core introduced
