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 grid with two diagonal lines of X's, one from top-left to bottom-right and the other from top-right to bottom-left, and an X in the top-right corner.
assistant
Expression: The target grid has an X in the top right corner, two Xs in the bottom left corner, and a diagonal line of Xs from the middle of the left side to the middle of the right side.
assistant