CREATE TABLE table_38798 ("Driver" CLOB, "Constructor" CLOB, "Laps" CLOB, "Time/Retired" CLOB, "Grid" CLOB)

Who was the constructor of the car that went 56 laps and had a grid of 15?
SELECT "Constructor" FROM table_38798 WHERE "Laps" = '56' AND "Grid" = '15'
SELECT "Constructor" FROM "table_38798" WHERE "Grid" = '15' AND "Laps" = '56'