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:
(row 1 column 1 and row 1 column 5) and (row 2 column 1 and row 2 column 2 and row 2 column 5) and (row 3 column 1 and row 3 column 2 and row 3 column 3 and row 3 column 5) and (row 4 column 1 and row 4 column 2 and row 4 column 3 and row 4 column 4
assistant
Expression: The target grid features a central diagonal of X's, with a surrounding border of X's and ▢'s, and a bottom-right corner of X's and ▢'s.

In this expression, we are highlighting the unique features of the target grid that distinguish it from the distractors. The central diagonal of X's is a key characteristic, as it is not present in either distractor grid. Additionally, the
assistant