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

Distractor grid 1:

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

Distractor grid 2:

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 top left corner has two empty cells followed by one filled cell, moving right, the next row has three empty cells followed by two filled cells, the third row has three filled cells, the fourth row has four filled cells, and the bottom row is completely filled.
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 row contains four cells. The top-left cell is empty, and the bottom-right cell is also empty. The remaining cells in the grid are filled with either "▢" or "X", representing the presence or absence of a pattern in the grid. 

To describe the target grid,
assistant