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URLs
- https://www.pixiv.net/users/26900
- https://www.pixiv.net/stacc/yamamoto_takeo
- https://twitter.com/yamamoto_takeo
- https://twitter.com/intent/user?user_id=124285463
- https://sadakichidou.booth.pm
- https://nijie.info/members.php?id=335060
- https://pawoo.net/@yamamoto_takeo
- https://skeb.jp/@yamamoto_takeo
- https://mixi.jp/show_friend.pl?id=3176446
- https://www.amazon.co.jp/-/e/B004LVVR0G/
- https://www.melonbooks.co.jp/circle/index.php?circle_id=20839
- https://illust.daysneo.com/illustrator/yamamoto_takeo/
- http://www.interq.or.jp/yamamoto/sadakich/
- https://market.orilab.jp/user/61f4f21b39b12
- https://skima.jp/profile?id=5305