user: Question: Which Builder has a Date of early 1871?
Columns: ['Number', 'Builder', 'Type', 'Date', 'Works number']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Avonside Engine Company', '4-4-0', 'September 1870', '808']
SQL:

assistant: SELECT "Builder" FROM "Table" WHERE "Date" = 'early 1871';