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 ▢ ▢ ▢ ▢

Distractor grid 1:

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

Distractor grid 2:

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 filled cells forming a diagonal line from the top-right to the bottom-left corner.
assistant
Expression: The grid with an X in the top right corner and no Xes in the bottom row.<|im_end|><|im_end|>

The referring expression "The grid with an X in the top right corner and no Xes in the bottom row" accurately describes the target grid by identifying a unique feature (an X in the top right corner) and a contrasting feature (no Xes in the bottom row) that distinguishes it from the other two grids. This expression is clear, concise, and specific enough
assistant