What was the score for the South American Championship dated December 13, 1925?
CREATE TABLE "brazil_national_team" (
  "date" text,
  "result" text,
  "score" text,
  "brazil_scorers" text,
  "competition" text
);
SELECT "result" FROM "brazil_national_team" WHERE "competition"='south american championship' AND "date"='december 13, 1925';