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In order to investigate the occurrence rate of the 14C increase event like the AD 775 one, we measured 14C content in Japanese tree-rings during an extended periods. As a result\uff0cwe detected the second 14C increase by significant amount from AD 993 to AD 994. From the occurrence rate (one 14C event/800 years)\uff0cit was revealed that a large-scale SPE is the most plausible explanation for the 14C event. 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