What is the region 1 date for series 4
CREATE TABLE table_15823956_1 (region_1 VARCHAR, series VARCHAR)
SELECT region_1 FROM table_15823956_1 WHERE series = "4"
### Context: CREATE TABLE table_15823956_1 (region_1 VARCHAR, series VARCHAR) ### Question: What is the region 1 date for series 4 ### Answer: SELECT region_1 FROM table_15823956_1 WHERE series = "4"