Table:
Stem	Leaf

1	1, 1, 3, 5, 7, 7, 8

2	3, 8, 9

3	1, 5, 7

4	0, 0, 0, 2, 5, 8

For the shown table, how many rows and columns are there? Format your final answer as a JSON, using the structure {"row_number": "m", "column_number": "n"}.

This table has 6 rows and 2 columns. Thus, the final answer is {"row_number": "6", "column_number": "2"}.