Who was the writer that the director was Alice Troughton and the producer was Phil Collinson?
CREATE TABLE "production" (
  "block" real,
  "episode_title" text,
  "director" text,
  "writer" text,
  "producer" text,
  "code" text
);
SELECT "writer" FROM "production" WHERE "producer"='phil collinson' AND "director"='alice troughton';