user: Question: Tell me the sum of silver for liechtenstein and bronze more than 4
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Iceland', 21.0, 7.0, 4.0, 32.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Nation" = 'liechtenstein' AND "Bronze" > 4.0;