Table schema:
CREATE TABLE table_name_11 (wk_3 INTEGER, wk_11 VARCHAR, wk_14 VARCHAR, wk_2 VARCHAR)

Question: What is the lowest wk 3 value with an n/r in wk 14, a wk 2 value of 7, and a wk 11 value greater than 18?
SQL: SELECT MIN(wk_3) FROM table_name_11 WHERE wk_14 = "n/r" AND wk_2 = 7 AND wk_11 > 18