what is the since beginning of big 12 when last 10 meetings is ou, 7-3, neutral site is ou, 2-1, and last 5 meetings is bu, 3-2?
CREATE TABLE "record_vs_big_12_opponents" (
  "oklahoma_vs" text,
  "overall_record" text,
  "at_norman" text,
  "at_opponent_s_venue" text,
  "at_neutral_site" text,
  "last_5_meetings" text,
  "last_10_meetings" text,
  "current_streak" text,
  "since_beginning_of_big_12" text
);
SELECT "since_beginning_of_big_12" FROM "record_vs_big_12_opponents" WHERE "last_10_meetings"='ou, 7-3' AND "at_neutral_site"='ou, 2-1' AND "last_5_meetings"='bu, 3-2';