user: Question: In 1879-81 with number built 4, what is the LMS nos?
Columns: ['Class', 'Date', 'Builder', 'No. built', '1919 nos.', 'LMS Class', 'LMS nos.']
Types: ['real', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: [157.0, '1879-81', 'G&SWR Kilmarnock', 12.0, '720-5', '1P', '14001-2']
SQL:

assistant: SELECT "LMS nos." FROM "Table" WHERE "Date" = '1879-81' AND "No. built" = 4.0;