<https://africa-keizai.com/category/%e3%82%b5%e3%83%b3%e3%83%88%e3%83%a1%e3%83%97%e3%83%aa%e3%83%b3%e3%82%b7%e3%83%9a/>
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"サントメプリンシペ"
<https://africa-keizai.com/travel_statistics_sao-tome-and-principe/>