user: Question: Which rounds did the team Walther participate in?
Columns: ['Team', 'Chassis', 'Engine', 'Driver(s)', 'Sponsor(s)', 'Rounds']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['A. J. Foyt Enterprises', 'Lola T8700', 'Cosworth', 'A. J. Foyt', 'Copenhagen -Gilmore', '3-4, 9-10, 13, 15']
SQL:

assistant: SELECT "Rounds" FROM "Table" WHERE "Team" = 'Walther';