Table:
Year
Competition
Venue
Position
Event
Notes

Representing South Africa

2000

World Junior Championships

Santiago, Chile

2nd

400 m hurdles

50.52

4th

4x400 m relay

3:07.66

2005

World Championships

Helsinki, Finland

17th (sf)

400 m hurdles

49.75

13th (h)

4x400 m relay

3:04.64

2006

Commonwealth Games

Melbourne, Australia

7th

400 m hurdles

50.51

African Championships

Bambous, Mauritius

4th

400 m hurdles

50.96

2007

All-Africa Games

Algiers, Algeria

2nd

400 m hurdles

48.91

8th

4x400 m relay

DNF

World Championships

Osaka, Japan

15th (sf)

400 m hurdles

49.37

2008

Olympic Games

Beijing, China

12th (sf)

400 m hurdles

49.44

Based on the given table, what are the contents of the cells in the following positions in the table? Return each cell value as JSON in the format {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}.
the 4th row and the 3rd column,
the 7th row and the 1st column,
the 4th row and the 1st column,
the 8th row and the 3rd column,
the 1st row and the 2nd column,
the 2nd row and the 4th column,
the 9th row and the 1st column,
the 2nd row and the 2nd column,

The extracted cell contents are listed below.
{"row_id":"4", "column_id":"3", "cell_value":"Helsinki, Finland"}
{"row_id":"7", "column_id":"1", "cell_value":"2006"}
{"row_id":"4", "column_id":"1", "cell_value":"2005"}
{"row_id":"8", "column_id":"3", "cell_value":"Algiers, Algeria"}
{"row_id":"1", "column_id":"2", "cell_value":"Competition"}
{"row_id":"2", "column_id":"4", "cell_value":"2nd"}
{"row_id":"9", "column_id":"1", "cell_value":"2007"}
{"row_id":"2", "column_id":"2", "cell_value":"World Junior Championships"}