What is the A.G. value associated with D3&4 of 46 and transmitter of Seaham?
CREATE TABLE "digital_television" (
  "transmitter" text,
  "bbca" real,
  "bbcb" text,
  "d3_4" text,
  "arqa" text,
  "arqb" text,
  "pol" text,
  "a_g" text
);
SELECT "a_g" FROM "digital_television" WHERE "d3_4"='46' AND "transmitter"='seaham';