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 ▢

Distractor grid 1:

▢ 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

Instruction: Describe the target grid.
Generate the referring expression starting with the tag "Expression: " for the given target grid. Omit any other text.
Expression: All cells are filled except those in the first column, which are empty.
assistant
Expression: The target grid has a consistent pattern of filled cells (X) arranged in a rectangular shape, with four rows and five columns. The empty cells (▢) are distributed throughout, forming a similar rectangular shape but with a slightly offset alignment.
assistant