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 the empty row at the top.
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Expression: The grid with an upper half of filled cells and a lower half of empty cells

The given target grid has all its cells filled in the top half, and all its cells are empty in the bottom half. Distractor grid 1 has filled cells in the bottom row, and distractor grid 2 has filled cells in the middle row, making the target grid distinct from the others.
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