Who has a Team classification of la vie claire, a stage of 20, a General classification of greg lemond?
CREATE TABLE "classification_leadership" (
  "stage" text,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "young_rider_classification" text,
  "team_classification" text
);
SELECT "winner" FROM "classification_leadership" WHERE "team_classification"='la vie claire' AND "general_classification"='greg lemond' AND "stage"='20';