user: Question: Tell me the lowest placings for united kingdom and rank less than 13
Columns: ['Rank', 'Name', 'Nation', 'Points', 'Placings']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'Marina Cherkasova / Sergei Shakhrai', 'Soviet Union', 144.64, 10.0]
SQL:

assistant: SELECT MIN("Placings") FROM "Table" WHERE "Nation" = 'united kingdom' AND "Rank" < 13.0;