CREATE TABLE table_name_86 (format VARCHAR, region_4 VARCHAR, _number_episodes VARCHAR, _number_disc_s_ VARCHAR)

What was the format for the 4 disc season that had less than 22 episodes and n/a for region 4?
SELECT format FROM table_name_86 WHERE _number_episodes < 22 AND _number_disc_s_ = 4 AND region_4 = "n/a"
SELECT "format" FROM "table_name_86" WHERE "_number_disc_s_" = 4 AND "_number_episodes" < 22 AND "n/a" = "region_4"