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" Bye Bye " ( バイバイ ) is the 19th single from Japanese singer Ai Otsuka , and the fourth single to be released from her Love Letter album .
 Ai Otsuka
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ai Otsuka