user: ### NOW ANSWER:
Question: I need the surpassed for years before 1925 and period of 6 years
Columns: ['Name', 'City', 'Height feet/m', 'Year', 'Period', 'Surpassed by']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Frank & Seder Building', 'Detroit', '135 / 41', 1881.0, '8 years', 'Hammond Building']
SQL:

assistant: SELECT "Surpassed by" FROM "Table" WHERE "Year" < 1925.0 AND "Period" = '6 years';