Table:
Athlete	Event	Heat	Quarterfinal	Semifinal	Final

Result	Rank	Result	Rank	Result	Rank	Result	Rank

Héctor Cotto	110 m hurdles	13.72	6 q	13.73	8	Did not advance

Javier Culson	400 m hurdles	49.60	4 q	N/A	49.85	8	Did not advance

David Freeman	1500 m	3:39.70	10	N/A	Did not advance

Félix Martínez	400 m	46.46	7	N/A	Did not advance

row 2 and column 4
Extract the content of cell in the above position, identified by row and column indices. Format the cell value as a JSON, using the structure {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}.

The target cell value in row 2 and column 4 is {"row_id":"2", "column_id":"4", "cell_value":"rank"}.