CREATE TABLE table_13403120_1 (repeatairdate_s_ VARCHAR, originalairdate VARCHAR)

What is the repeat date of the episode that aired 22/12/1968?
SELECT repeatairdate_s_ FROM table_13403120_1 WHERE originalairdate = "22/12/1968"
SELECT "repeatairdate_s_" FROM "table_13403120_1" WHERE "22/12/1968" = "originalairdate"