Table:
book about birds	$22.30

book about basketball	$10.02

book about Antarctica	$22.98

book about reptiles	$19.24

book about sharks	$11.41

book about airplanes	$15.51

Retrieve the cell contents in the 4th row of this table. Represent the cells in a row with the JSON format {"row_id":"<row index>", "cell_list":"<a list of cells in this row>"}. For instance, {"row_id":"5", "cell_list": ["152", "UN", "one last kiss"]}.

The target cell values of the 4th row: {"row_id": "4", "cell_list": ['book about reptiles', '$19.24']}