Column 2 filled. Now add vertical annotations along the same column.
Four vertical annotations stacking in column 2 – labels fight for space.
Row 2 filled. Now add horizontal annotations along the same row.
Four horizontal annotations along row 2 – labels overlap horizontally.
Diagonal cells filled. Now add crossing diagonal annotations.
Four diagonal arrows all converging on cell [2][2] from different corners.
Long diagonal arrows crossing the entire grid in opposite directions.
Center cell and its four orthogonal neighbors filled.
Four annotations from left, right, above, and below all targeting cell [2][2]. Labels collide at the center.