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

Distractor grid 1:

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 ▢ ▢

Instruction: Describe the target grid.
Generate the referring expression starting with the tag "Expression: " for the given target grid. Omit any other text.
Expression: Top row has all filled cells, middle row has two filled cells in the first and second column, third row has one filled cell in the first column and two filled cells in the fourth and fifth column, bottom row has all filled cells, and all columns except the first and last have one empty cell in the third column.
assistant
Expression: Target grid

The target grid is a 5x5 grid filled with squares, where each square is either a "X" or a "▢". The grid has four rows and five columns, and there are no empty spaces between the cells. The pattern of the grid is as follows:
- In the top-left corner, there is a single "X" cell.
- To the right of the first "X", there are three more "X" cells, forming a triangle.
assistant