https://static1.e621.net/data/63/36/6336a4e2b39507e7d883aa409cd4af62.webm
: https://static1.e621.net/data/98/4e/984e96d91179a0e8550bef3c3852dfd2.webm
https://static1.e621.net/data/41/ec/41ec6ed5e3257b2c38c5f55820fdf494.webm
- https://static1.e621.net/data/11/70/1170b3dafdb34593fe4829922ae44c2c.webm
- https://static1.e621.net/data/06/f5/06f5636c30db1be7f7dc6a5c16358504.webm
https://e621.net/posts/2721717?q=zero-sum