https://e621.net/posts/2513871?q=zero-sum
https://static1.e621.net/data/09/b8/09b8aab9aa8287f7580e283a3df0f546.webm
- https://static1.e621.net/data/60/d6/60d6d34c835fde296cd44f73aac17c05.webm
https://static1.e621.net/data/63/36/6336a4e2b39507e7d883aa409cd4af62.webm
- https://static1.e621.net/data/80/e6/80e6475302668c024cd3f52c22ef0edd.webm
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