Table:
sub-groups of the agri-food industry
eastern ontario
northern ontario

french-language workers
other workers
french-language workers
other workers

percent

input and service supply
2.9
2.1
2.9
1.3

food, beverage, and tobacco processing
9.7
6.0
3.0
3.3

food retail and wholesale
35.3
31.3
39.1
37.3

food service
52.1
60.6
55.0
58.1

Inspect the given table and provide the values of cells found at the specified positions, determined 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:
row 7 and column 1
row 7 and column 5
row 6 and column 2
row 2 and column 4

The extracted cell contents are listed below.
{"row_id":"7", "column_id":"1", "cell_value":"food service"}
{"row_id":"7", "column_id":"5", "cell_value":"58.1"}
{"row_id":"6", "column_id":"2", "cell_value":"35.3"}
{"row_id":"2", "column_id":"4", "cell_value":"french-language workers"}