user: Question: What class has 4-4-0 wheels and was less than number 40 built?
Columns: ['Class', 'Wheels', 'Date', 'Builder', 'No. Built']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['K1', '2-6-4T', '1925', 'Ashford', 1.0]
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Wheels" = '4-4-0' AND "No. Built" < 40.0;