Table schema:
CREATE TABLE table_name_59 (copa_libertadores_1992 VARCHAR, supercopa_sudamericana_1992 VARCHAR, team VARCHAR)

Question: Which Copa Libertadores 1992 has a Supercopa Sudamericana 1992 of round of 16, and a Team of grêmio?
SQL: SELECT copa_libertadores_1992 FROM table_name_59 WHERE supercopa_sudamericana_1992 = "round of 16" AND team = "grêmio"