Table:
Date
Competition
Location
Country
Event
Placing
Rider
Nationality

31 October 2008
2008–09 World Cup
Manchester
United Kingdom
Sprint
1
Victoria Pendleton
GBR

31 October 2008
2008–09 World Cup
Manchester
United Kingdom
Keirin
2
Jason Kenny
GBR

1 November 2008
2008–09 World Cup
Manchester
United Kingdom
Sprint
1
Jason Kenny
GBR

1 November 2008
2008–09 World Cup
Manchester
United Kingdom
500 m time trial
1
Victoria Pendleton
GBR

2 November 2008
2008–09 World Cup
Manchester
United Kingdom
Team sprint
1
Ross Edgar
GBR

2 November 2008
2008–09 World Cup
Manchester
United Kingdom
Team sprint
1
Jason Kenny
GBR

2 November 2008
2008–09 World Cup
Manchester
United Kingdom
Team sprint
1
Jamie Staff
GBR

2 November 2008
2008–09 World Cup
Manchester
United Kingdom
Keirin
1
Victoria Pendleton
GBR

2 November 2008
5th International Keirin Event
Manchester
United Kingdom
International keirin
2
Ross Edgar
GBR

13 February 2009
2008–09 World Cup
Copenhagen
Denmark
Team sprint
1
Chris Hoy
GBR

13 February 2009
2008–09 World Cup
Copenhagen
Denmark
Team sprint
1
Jason Kenny
GBR

13 February 2009
2008–09 World Cup
Copenhagen
Denmark
Team sprint
1
Jamie Staff
GBR

13 February 2009
2008–09 World Cup
Copenhagen
Denmark
Sprint
1
Victoria Pendleton
GBR

30 October 2009
2009–10 World Cup
Manchester
United Kingdom
Keirin
1
Chris Hoy
GBR

30 October 2009
2009–10 World Cup
Manchester
United Kingdom
Sprint
1
Victoria Pendleton
GBR

30 October 2009
2009–10 World Cup
Manchester
United Kingdom
Sprint
1
Chris Hoy
GBR

30 October 2009
2009–10 World Cup
Manchester
United Kingdom
500 m time trial
2
Victoria Pendleton
GBR

1 November 2009
2009–10 World Cup
Manchester
United Kingdom
Team sprint
1
Ross Edgar
GBR

1 November 2009
2009–10 World Cup
Manchester
United Kingdom
Team sprint
1
Chris Hoy
GBR

1 November 2009
2009–10 World Cup
Manchester
United Kingdom
Team sprint
1
Jamie Staff
GBR

Examine the given table and identify the contents of cells located at specified locations, denoted by row and column indices. Represent each cell value in the JSON format {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}. For instance, {"row_id":"5", "column_id":"4", "cell_value":"missouri 4"}.
Specified positions:
row 7 and column 7,
row 12 and column 6,
row 13 and column 3,

The target cell values are as follows:
{"row_id":"7", "column_id":"7", "cell_value":"Jason Kenny"}
{"row_id":"12", "column_id":"6", "cell_value":"1"}
{"row_id":"13", "column_id":"3", "cell_value":"Copenhagen"}