user: Question: What set 2 has a set 4 of 21-25?
Columns: ['Date', 'Score', 'Set 1', 'Set 2', 'Set 3', 'Set 4', 'Set 5', 'Total']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Jun 28', '3-0', '25-21', '25-22', '25-18', 'NA', 'NA', '75 - 61']
SQL:

assistant: SELECT "Set 2" FROM "Table" WHERE "Set 4" = '21-25';