user: Question: What manufacturer made 6 and preserved 1?
Columns: ['Class', 'Wheel arrangement', 'Fleet number(s)', 'Manufacturer', 'Year made', 'Quantity made', 'Quantity preserved']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['0-6-0 — OOO', '0-6-0 — OOO', '0-6-0 — OOO', '0-6-0 — OOO', '0-6-0 — OOO', '0-6-0 — OOO', '0-6-0 — OOO']
SQL:

assistant: SELECT "Manufacturer" FROM "Table" WHERE "Quantity made" = '6' AND "Quantity preserved" = '1';