Name the Time which has a Manufacturer of aprilia, and a Grid smaller than 16, and a Rider of sandro cortese?
CREATE TABLE "125cc_classification" (
  "rider" text,
  "manufacturer" text,
  "laps" real,
  "time" text,
  "grid" real
);
SELECT "time" FROM "125cc_classification" WHERE "manufacturer"='aprilia' AND "grid"<16 AND "rider"='sandro cortese';