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: The grid with a solid bottom row, an empty top row, and three vertical lines of X's in the middle, each starting one cell below the previous one.
assistant
Expression: The target grid has a single filled cell in the third column of the first two rows, a horizontal line of filled cells in the third row with the middle cell connected to a vertical line of filled cells that extends through the fourth row and completes a full horizontal line of filled cells in the fifth row.
assistant