Question: What is the region 2 for The Complete Fifth Series?
SQL: SELECT "Region 2" FROM "1-1337525-1" WHERE "Complete Series" = 'The Complete Fifth Series';

Question: What is the number of region 4 for the series of The Complete Seventh Series?
SQL: SELECT COUNT("Region 4") FROM "1-1337525-1" WHERE "Complete Series" = 'The Complete Seventh Series';

Question: What is the region 1 where region 4 is TBA is The Complete Eighth Series?
SQL: SELECT "Region 1" FROM "1-1337525-1" WHERE "Region 4" = 'TBA' AND "Complete Series" = 'The Complete Eighth Series';

Question: Name the region 4 for The Complete Fifth Series
SQL: SELECT "Region 4" FROM "1-1337525-1" WHERE "Complete Series" = 'The Complete Fifth Series';