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URLs
- https://twitter.com/POLYGONPICTURES
- https://twitter.com/intent/user?user_id=158179251
- http://en.wikipedia.org/wiki/Polygon_Pictures
- http://ja.wikipedia.org/wiki/γγͺγ΄γ³γ»γγ―γγ₯γ’γΊ
- https://anidb.net/creator/30744
- http://www.animenewsnetwork.com/encyclopedia/company.php?id=4268
- http://www.ppi.co.jp