What is the 8:30 program that airs on the station that airs various programs at 7:30?
CREATE TABLE "friday" (
  "7_00" text,
  "7_30" text,
  "8_00" text,
  "8_30" text,
  "9_00" text,
  "9_30" text,
  "10_00" text,
  "10_30" text
);
SELECT "8_30" FROM "friday" WHERE "7_30"='various programs';