##....... ##....... ......... .......#. .....#... ........# ......#.. ......... .........
2 The square with vertices $(1,1)$, $(1,2)$, $(2,2)$, and $(2,1)$ have pawns placed at all four vertices. The square with vertices $(4,8)$, $(5,6)$, $(7,7)$, and $(6,9)$ also have pawns placed at all four vertices. Thus, the answer is $2$.
.#....... #.#...... .#....... ......... ....#.#.# ......... ....#.#.# ........# .........
3
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"content": "There is a two-dimensional plane. For integers $r$ and $c$ between $1$ and $9$, there is a pawn at the coordinates $(r,c)$ if the $c$\\-th character of $S_{r}$ is `#`, and nothing if the $c$\\-th charac...",
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