user: Question: What is the total number of all bills co-sponsored associated with all amendments sponsored under 15, all bills sponsored of 6, and 0 amendments cosponsored?
Columns: ['Years covered', 'All bills sponsored', 'All amendments sponsored', 'All bills cosponsored', 'All amendments cosponsored', 'Bills originally cosponsored', 'Amendments originally cosponsored']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['2007–08', 22.0, 16.0, 133.0, 74.0, 101.0, 57.0]
SQL:

assistant: SELECT SUM("All bills cosponsored") FROM "Table" WHERE "All amendments sponsored" < 15.0 AND "All bills sponsored" = 6.0 AND "All amendments cosponsored" < 0.0;