CREATE TABLE table_39737 ("DVD Season" TEXT, "Format" TEXT, "# Episodes" FLOAT, "# Disc ( s ) " FLOAT, "Region 4" TEXT)

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_39737 WHERE "# Episodes" < '22' AND "# Disc(s)" = '4' AND "Region 4" = 'n/a'
SELECT "Format" FROM "table_39737" WHERE "# Disc(s)" = '4' AND "# Episodes" < '22' AND "Region 4" = 'n/a'