user: Question: What is the sum of 1891(s), when 1872 is less than 685, and when 1881 is less than 348?
Columns: ['1861', '1866', '1872', '1876', '1881', '1886', '1891']
Types: ['real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1080.0, 1070.0, 1084.0, 1040.0, 962.0, 985.0, 998.0]
SQL:

assistant: SELECT SUM("1891") FROM "Table" WHERE "1872" < 685.0 AND "1881" < 348.0;