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As an encore , Kristian quickly followed that success by co-writing & producing " Tearin ' Up My Heart " for 'N Sync , which became their hot ticket to the charts .
 person: Kristian
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: Kristian