What is the sum of Blks, when Stls is 1, and when Rebs is greater than 8.6?
CREATE TABLE "college_statistics" (
  "year" text,
  "rebs" real,
  "asts" real,
  "stls" real,
  "blks" real
);
SELECT SUM("blks") FROM "college_statistics" WHERE "stls"=1 AND "rebs">8.6;