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

Distractor grid 1:

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

Distractor grid 2:

▢ ▢ ▢ ▢ ▢
▢ ▢ ▢ ▢ ▢
▢ 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:
(row 1 col 1 to col 5 is not X) and (row 2 col 1 to col 5 is not X) and (row 3 col 1 to col 5 is not X) and (row 4 col 1 to col 5 is not X) and (row 5 col 1 to col 5 is not X) and (row 1 col 1 to col 5 is not X) and (
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Expression: The target grid has a unique pattern of alternating rows and columns filled with Xs, while the distractors have different patterns of filled cells. In particular, the first distractor has all corners filled but no rows or columns, the second distractor is completely empty, and the target grid has a distinctive checkerboard appearance. The target grid can be described as "a 5x5 grid with an alternating X pattern."
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