Table schema:
CREATE TABLE table_name_12 (conmebol_1994 VARCHAR, team VARCHAR, supercopa_1994 VARCHAR, recopa_1994 VARCHAR)

Question: Which CONMEBOL 1994 has a Supercopa 1994 of n/a, and a Recopa 1994 of n/a, and a Team of san lorenzo?
SQL: SELECT conmebol_1994 FROM table_name_12 WHERE supercopa_1994 = "n/a" AND recopa_1994 = "n/a" AND team = "san lorenzo"