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

Distractor grid 2:

X ▢ ▢ ▢ X
X ▢ ▢ ▢ 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: A grid with X in the top-left and bottom-right corners, and a diagonal line of X's from the top-left to the bottom-right.
assistant
Expression: The 5x5 grid with four Xs bordered by ▢s in the first, second, fourth, and fifth rows, and one X in the third row bordered by Xs on both sides.<|im_end|><|im_end|>

The referring expression accurately describes the target grid by specifying its size, the positions of the "X" cells, and the empty cells ("▢") that border the "X" cells, distinguishing it from the two other distract
assistant