Who is in group c when iowa is in group e?
CREATE TABLE "proposed_regions" (
  "region" real,
  "group_a" text,
  "group_b" text,
  "group_c" text,
  "group_d" text,
  "group_e" text,
  "group_f" text
);
SELECT "group_c" FROM "proposed_regions" WHERE "group_e"='Iowa';