Which task had Cathy as the hand grenade user?
CREATE TABLE "head_of_household_and_hand_grenade" (
  "task_no" real,
  "date_given" text,
  "head_of_household" text,
  "hand_grenade_user" text,
  "hand_grenade_recipient" text
);
SELECT "task_no" FROM "head_of_household_and_hand_grenade" WHERE "hand_grenade_user"='cathy';