By Joseph Campbell and John Geddie TOKYO (Reuters) -Within days of China urging its citizens not to travel to Japan due to a diplomatic dispute, Tokyo-based tour operator East Japan International Travel Service had lost 80% of its bookings for the remainder of the year. The small firm, which specialises in group tours largely for Chinese clients, is at the sharp end of a backlash that threatens to deal a sizeable blow to Japan's economy, the world's fourth largest. The travel warning – triggered by Japanese Prime Minister Sanae Takaichi's remarks about Taiwan, the democratically governed island claimed by China – has seen a wave of flight cancellations and battered tourism-related stocks in Japan. "This is a huge loss for us," said Yu Jinxin, vice president of East Japan International Trav

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