What is Part 4, when Part 2 is "hljóp"?
CREATE TABLE "north_germanic" (
  "class" text,
  "part_1" text,
  "part_2" text,
  "part_3" text,
  "part_4" text
);
SELECT "part_4" FROM "north_germanic" WHERE "part_2"='hljóp';