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 grid that is filled from top to bottom, with the number of X's decreasing from left to right in each row.
assistant
Expression: The top row of the grid has five X's, the second row has four X's and one empty cell from left to right, the third row has three X's and two empty cells, the fourth row has two X's and three empty cells, and the bottom row has one X and four empty cells.
assistant