What is the largest number of 10 C points for a team with 39 total points?
CREATE TABLE "relegation" (
  "pos" real,
  "team" text,
  "07_a_pts" real,
  "08_c_pts" real,
  "08_a_pts" real,
  "09_c_pts" real,
  "09_a_pts" real,
  "10_c_pts" real,
  "total_pts" real,
  "total_pld" real,
  "avg" text
);
SELECT MAX("10_c_pts") FROM "relegation" WHERE "total_pts"=39;