user: Question: What is the series number when Al Horford (10) had the high rebounds?
Columns: ['Game', 'Date', 'Team', 'Score', 'High points', 'High rebounds', 'High assists', 'Location Attendance', 'Series']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'May 2', '@ Chicago', 'W 103–95 (OT)', 'Joe Johnson (34)', 'Al Horford (13)', 'Jeff Teague (5)', 'United Center 22,890', '1–0']
SQL:

assistant: SELECT "Series" FROM "Table" WHERE "High rebounds" = 'Al Horford (10)';