a grid of 8x8 text cells. most of them have 0 in them, but others start with an operator (equals, vertical bar, exclamation mark) followed by one or two chessboard-like coordinates. three of them have the notation i0, i1, or i2.
https://assets.merveilles.town/media_attachments/files/107/640/980/902/539/801/original/5e2247166ff86e34.png