user: Question: What is the lowest rank of the united states, with fewer than 4 bronze medals?
Columns: ['Rank', 'Nation', 'Gold', 'Silver', 'Bronze', 'Total']
Types: ['real', 'text', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Brazil', 19.0, 19.0, 17.0, 55.0]
SQL:

assistant: SELECT MIN("Rank") FROM "Table" WHERE "Nation" = 'united states' AND "Bronze" < 4.0;