Which release had 6 DVDs?
CREATE TABLE table_25721_4 (release VARCHAR, _number_of_discs VARCHAR)
SELECT release FROM table_25721_4 WHERE _number_of_discs = 6
### Context: CREATE TABLE table_25721_4 (release VARCHAR, _number_of_discs VARCHAR) ### Question: Which release had 6 DVDs? ### Answer: SELECT release FROM table_25721_4 WHERE _number_of_discs = 6