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

Distractor grid 1:

X X ▢ X X
X 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: Grid with a single empty cell in the center and surrounded by filled cells
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Expression: The target grid has a unique pattern of alternating rows and columns filled with X's, while the distractors have either all or no cells filled with X's in their respective patterns. In particular, the target grid has two sets of four consecutive X's arranged diagonally from opposite corners, creating an "X" shape within the grid. Additionally, there are three empty cells locations in the center of the grid. The distractor grids do not share this specific
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