You are given three grids, where each of them is 5 by 5 in size.
Grids have empty cells marked with "▢" and filled cells marked with "X".
Your task is to generate a referring expression that best describes the target grid while distinguishing it from the two other distractor grids.
The first grid is the target grid, and the following two grids are the distractors.

Target grid:

X X ▢ X X
X X ▢ X X
X X X X X
X X ▢ X X
X X ▢ X X

Distractor grid 1:

X X ▢ X X
X X ▢ X X
▢ ▢ ▢ ▢ ▢
X X ▢ X X
X X ▢ X X

Distractor grid 2:

X X X X X
X X X X X
▢ ▢ X ▢ ▢
X X X X X
X X X X X

Instruction: Describe the target grid.
Generate the referring expression starting with the tag "Expression: " for the given target grid. Omit any other text.
Expression: The grid with a filled top-left corner, a filled bottom-right corner, and a filled cell in the center of each row and column, except for the bottom-left corner.
assistant
Expression: Top left corner has two X's, middle row has one X and one empty cell, bottom left corner has four X's, bottom middle has one X and one empty cell, and bottom right corner has two X's and two empty cells.
assistant