What is the Surface of the court in the match with a Score of 4–6, 6–4, 3–6?
CREATE TABLE "doubles_12_6_6" (
  "outcome" text,
  "year" real,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);
SELECT "surface" FROM "doubles_12_6_6" WHERE "score"='4–6, 6–4, 3–6';