CREATE TABLE table_31815 ("Year" FLOAT, "Team" TEXT, "Co-Drivers" TEXT, "Class" TEXT, "Laps" FLOAT, "Pos." TEXT, "Class Pos." TEXT)

What classes have driven greater than 133 laps, placed above 18th position and have a class position of 1st?
SELECT "Class" FROM table_31815 WHERE "Laps" > '133' AND "Pos." = '18th' AND "Class Pos." = '1st'
SELECT "Class" FROM "table_31815" WHERE "Class Pos." = '1st' AND "Laps" > '133' AND "Pos." = '18th'