CREATE TABLE table_61686 ("Model" CLOB, "Chassis code" CLOB, "Production time" CLOB, "Number built" FLOAT, "Engine" CLOB)

What model has a number built smaller than 6.526, and the Chassis code w109.015?
SELECT "Model" FROM table_61686 WHERE "Number built" < '6.526' AND "Chassis code" = 'w109.015'
SELECT "Model" FROM "table_61686" WHERE "Chassis code" = 'w109.015' AND "Number built" < '6.526'