user: Question: What is the average silver that has a gold greater than 3, with soviet union (urs) as the nation, and a bronze greater than 26?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Soviet Union (URS)', 33.0, 29.0, 26.0, 88.0]
SQL:

assistant: SELECT AVG("Silver") FROM "Table" WHERE "Gold" > 3.0 AND "Nation" = 'soviet union (urs)' AND "Bronze" > 26.0;