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

Distractor grid 1:

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

Distractor grid 2:

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 has a column of X's in the first column, except for the top cell which is empty. The second column has X's in the first and last two cells. The third column has X's only in the top two cells. The fourth column has an X only in the second cell. The fifth column has an X only in the bottom cell.
assistant
Expression: The grid with two vertical stripes of three Xs each, separated by a single ▢, and a horizontal stripe of two Xs at the top, in the middle of five ▢s.<|im_end|><|im_end|>
The target grid is characterized by its unique pattern of Xs and ▢s. It has two vertical stripes of three Xs each, separated by a single ▢, and a horizontal stripe of two Xs at the top,
assistant