Table:
Stem	Leaf

3	1, 1, 4, 4, 7, 8, 9

4	2, 5, 5, 5, 6, 8

5	4, 8

6	1, 2, 3, 4, 6, 9

Based on the given table, what are the contents of the cells in the following positions in the table? Show the cell value in the JSON format {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}.
the 5th row and the 2nd column
the 4th row and the 2nd column
the 6th row and the 2nd column
the 3rd row and the 2nd column
the 1st row and the 1st column
the 2nd row and the 2nd column
the 4th row and the 1st column

The target cell values are as follows:
{"row_id":"5", "column_id":"2", "cell_value":"4, 8"}
{"row_id":"4", "column_id":"2", "cell_value":"2, 5, 5, 5, 6, 8"}
{"row_id":"6", "column_id":"2", "cell_value":"1, 2, 3, 4, 6, 9"}
{"row_id":"3", "column_id":"2", "cell_value":"1, 1, 4, 4, 7, 8, 9"}
{"row_id":"1", "column_id":"1", "cell_value":"Midterm exam scores"}
{"row_id":"2", "column_id":"2", "cell_value":"Leaf "}
{"row_id":"4", "column_id":"1", "cell_value":"4"}