Table schema:
CREATE TABLE table_name_80 (all_bills_cosponsored VARCHAR, all_amendments_cosponsored VARCHAR, all_amendments_sponsored VARCHAR, all_bills_sponsored VARCHAR)

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?
SQL: SELECT COUNT(all_bills_cosponsored) FROM table_name_80 WHERE all_amendments_sponsored < 15 AND all_bills_sponsored = 6 AND all_amendments_cosponsored < 0