user: Question: Which constructor has 10-12 rounds and a M7A chassis?
Columns: ['Entrant', 'Constructor', 'Chassis', 'Tyre', 'Driver', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Bruce McLaren Motor Racing', 'McLaren - BRM', 'M5A', 'G', 'Denny Hulme', '1']
SQL:

assistant: SELECT "Constructor" FROM "Table" WHERE "Rounds" = '10-12' AND "Chassis" = 'M7A';