もしも推古天皇の前の天皇が常に30年ごとに世代交代していたら何世代か
もし、推古天皇までの天皇がそれぞれ前の代が31歳のときに1歳という風に、30年ごとに生まれていたらどうなるか。


紀元前190_01
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紀元後_01_11___41
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____09_19___49 2000年前、日本は100余りのクニに分かれ、
____10_20___50 シナの楽浪郡に貢ぎ物(『マンガ日本史』)
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