Table:
Number of trips	Frequency

1	19

2	4

3	18

4	9

5	6

Based on the provided table, please extract the cells' values located at the specified positions, as denoted by row and column indices. The value of every target cell should be presented in the JSON format of {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}, e.g., {"row_id":"10", "column_id":"3", "cell_value":"District"}.
Positions:
the 6th row and the 2nd column,
the 1st row and the 1st column,
the 2nd row and the 2nd column,
the 5th row and the 1st column,
the 3rd row and the 2nd column,
the 7th row and the 2nd column,
the 7th row and the 1st column,
the 5th row and the 2nd column,

The extracted cell contents are listed below.
{"row_id":"6", "column_id":"2", "cell_value":"9"}
{"row_id":"1", "column_id":"1", "cell_value":"Trips to the grocery store last week"}
{"row_id":"2", "column_id":"2", "cell_value":"Frequency"}
{"row_id":"5", "column_id":"1", "cell_value":"3"}
{"row_id":"3", "column_id":"2", "cell_value":"19"}
{"row_id":"7", "column_id":"2", "cell_value":"6"}
{"row_id":"7", "column_id":"1", "cell_value":"5"}
{"row_id":"5", "column_id":"2", "cell_value":"18"}