user: ### NOW ANSWER:
Question: Which Silver has a Gold of 2, and a Nation of puerto rico, and a Total smaller than 12?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Cuba', 18.0, 15.0, 8.0, 41.0]
SQL:

assistant: SELECT SUM("Silver") FROM "Table" WHERE "Gold" = 2.0 AND "Nation" = 'puerto rico' AND "Total" < 12.0;