CREATE TABLE table_71707 ("Rider" TEXT, "Manufacturer" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What rider is on an aprilia that went under 18 laps with a grid total of 17?
SELECT "Rider" FROM table_71707 WHERE "Manufacturer" = 'aprilia' AND "Laps" < '18' AND "Grid" = '17'
SELECT "Rider" FROM "table_71707" WHERE "Grid" = '17' AND "Laps" < '18' AND "Manufacturer" = 'aprilia'