user: Question: What is the IHSAA class for the school in 10 Clark county with mascot of the Mustangs?
Columns: ['School', 'Location', 'Mascot', 'Enrollment', 'IHSAA Class', 'County']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Borden', 'Borden', 'Braves', 234.0, 'A', '10 Clark']
SQL:

assistant: SELECT "IHSAA Class" FROM "Table" WHERE "County" = '10 Clark' AND "Mascot" = 'Mustangs';