What is the winning score with a margin of victory of 4 strokes for the NEC Invitational tournament?
CREATE TABLE "european_tour_wins_14" (
  "date" text,
  "tournament" text,
  "winning_score" text,
  "margin_of_victory" text,
  "runner_s_up" text
);
SELECT "winning_score" FROM "european_tour_wins_14" WHERE "margin_of_victory"='4 strokes' AND "tournament"='nec invitational';