What was the Visitor when the home was toronto maple leafs and the score was 4–1?
CREATE TABLE "toronto_maple_leafs_4_montreal_canadiens" (
  "date" text,
  "visitor" text,
  "score" text,
  "home" text,
  "record" text
);
SELECT "visitor" FROM "toronto_maple_leafs_4_montreal_canadiens" WHERE "home"='toronto maple leafs' AND "score"='4–1';