col : rank | name | nationality | time row 1 : nan | mark henderson | united states | 54.11 row 2 : nan | eduardo piccinini | brazil | 54.63 row 3 : nan | brian alderman | united states | 54.75 row 4 : 4.0 | francisco sanchez | venezuela | 54.99 row 5 : 5.0 | edward parenti | canada | 55.23 row 6 : 6.0 | diego cuenca | colombia | 55.67 row 7 : 7.0 | jose meolans | argentina | 55.91 row 8 : 8.0 | ruben calderon | el salvador | 56.04
who played in the 100 metre butterfly? what were their ranks? and who ranked number 8?
ruben calderon
Rank Name Nationality Time
and who ranked number 8?
nan Mark Henderson United States 54.11
nan Eduardo Piccinini Brazil 54.63
nan Brian Alderman United States 54.75
4.0 Francisco Sanchez Venezuela 54.99
5.0 Edward Parenti Canada 55.23
6.0 Diego Cuenca Colombia 55.67
7.0 Jose Meolans Argentina 55.91
8.0 Ruben Calderon El Salvador 56.04
Ruben Calderon
and who ranked number 8? || what were their ranks? | who played in the 100 metre butterfly?