CREATE TABLE "list" (
  "con_gress" text,
  "district" text,
  "vacator" text,
  "election_date" text,
  "successor" text,
  "took_seat" text
);

Question: Name the number of districts for december 1799
SQL: SELECT COUNT("district") FROM "list" WHERE "election_date"='December 1799';

Question: Name the vacator for took seat being january 29, 1813
SQL: SELECT "vacator" FROM "list" WHERE "took_seat"='January 29, 1813';