Table:
Carlson Gracie
Born	August 13, 1933
Rio de Janeiro, Brazil
Died	February 1, 2006(2006-02-01) (aged 72)
Chicago, Illinois
Heart Failure
Other names	Champion
Nationality	Brazilian
Height	5'11
Weight	67–72 kg (148–159 lb; 10 st 8 lb – 11 st 5 lb)
Style	Brazilian Jiu-Jitsu
Fighting out of	Rio de Janeiro & Chicago, Illinois
Team	Carlson Gracie Team
Teacher(s)	Carlos Gracie, Helio Gracie
Rank	9th degree red belt in Brazilian Jiu-Jitsu
Other information
Notable students	Carlson Gracie Jr., Ricardo De La riva, Allan Goes, Murilo Bustamante, Mario Sperry, Wallid Ismail, Pablo Popovitch, Andre Pederneiras, Ricardo Liborio, Marcelo Saporito, Julio "Foca" Fernandez, Rodrigo Medeiros, Vitor Belfort, Miguel Angel Torres, Stephan Bonnar, Javier Vazquez, Carlos "Carlão" Santos, Carlos Barreto, Marcos da Matta
Website	http://www.carlsongraciefederation.com/ http://www.carlsongraciechicago.com

Retrieve the values of cells at the given table positions, indicated by row and column indices. Output each cell content as JSON in the format {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}.
Positions to check:
the 16th row and the 1st column
the 4th row and the 2nd column

The extracted cell contents are listed below.
{"row_id":"16", "column_id":"1", "cell_value":"teacher"}
{"row_id":"4", "column_id":"2", "cell_value":"200px"}