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2008.4.22, a strongly serious discussion with a Japanses--- Tsujimori Tatsuki ---my supervisor;

2008.4.23, a peaceful discussion with Pro. Nakamura Eizo and making a decision to quit my PhD study in Japan;

2008.4.30, signed and submitted document to Okayama University;

2008.5.7, took a flight and left Japan.