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: The target grid is a 5x5 grid filled with X's, with a single row of empty cells at the top.
assistant
Expression: Target grid

The target grid is a 5x5 grid filled with empty cells marked with "▢" and filled cells marked with "X". The grid has four rows and five columns, and each cell contains either a "X" or a "▢". The pattern of the grid is as follows:
- In the top-left corner, there is a row of "X" cells, followed by a row of "X" cells, and so on, until reaching the bottom-right
assistant