Which stage has a mountains classification of Mariano Piccoli, a points classification of Mario Cipollini and was won by Laudelino Cubino?
CREATE TABLE "classification_leadership_by_stage" (
  "stage" text,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "mountains_classification" text,
  "trofeo_fast_team" text
);
SELECT "stage" FROM "classification_leadership_by_stage" WHERE "mountains_classification"='mariano piccoli' AND "points_classification"='mario cipollini' AND "winner"='laudelino cubino';