CREATE TABLE table_name_59 (copa_libertadores_1992 VARCHAR(255), supercopa_sudamericana_1992 VARCHAR(255), team VARCHAR(255))
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"