Tell me the highest Laps for grid less than 22 and riderS of ruben xaus
CREATE TABLE "superbike_race_2_classification" (
  "rider" text,
  "bike" text,
  "laps" real,
  "time" text,
  "grid" real
);
SELECT MAX("laps") FROM "superbike_race_2_classification" WHERE "grid"<22 AND "rider"='ruben xaus';