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 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: The grid with an empty row in the middle.
assistant
Expression: The target grid has a rectangular shape with five rows and five columns. It has a total of ten filled cells, with five cells in each row and column. The filled cells are marked with "X" and are located in the top-left, top-right, bottom-left, and bottom-right corners of the grid. The remaining cells are empty and marked with "▢".
assistant