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 ▢ 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 X ▢

Distractor grid 2:

▢ X X X X
X ▢ X X 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 5x5 grid with a single isolated 'X' in the bottom right corner, surrounded by '▢', and with the rest of the cells filled with 'X' except for the top left corner which contains a single '▢'.<|end|>
assistant
Expression: The 5 by 5 grid with four Xs forming a square in the top left and bottom right corners, and two Xs in the middle row forming an L-shape, with a single X in the middle column.<|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|><|im_end|>
assistant