Which series occurred in which the semi-finalist was runner-up and the 7800.00 was 6420.00?
CREATE TABLE "other_results" (
  "22_06_2008" text,
  "indonesia_super_series_2008" text,
  "s_series" text,
  "7800_00" text,
  "runner_up" text
);
SELECT "indonesia_super_series_2008" FROM "other_results" WHERE "runner_up"='Semi-Finalist' AND "7800_00"='6420.00';