[They'll keep this simple. It's only fair. Chara takes the photo from their inventory. Sans should recognize it.

And then....they stop pretending. There's absolutely no emotion left in their voice.]

We reached the absolute. All of you got your ending. But this photo was taken when we got to the Surface again. It was a complete ERASE...yet I was called again.

[So here's their little joke, something the scientist in you might like Sans.]

So in regards to that system....what is two plus one?