user: Question: What is the lowest heat for the united states with a mark of 51.85 pb and lane higher than 6?
Columns: ['Heat', 'Lane', 'Name', 'Country', 'Mark']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 5.0, 'Olesya Zykina', 'Russia', '51.75']
SQL:

assistant: SELECT MIN("Heat") FROM "Table" WHERE "Country" = 'united states' AND "Mark" = '51.85 pb' AND "Lane" > 6.0;