How many different provinces is Baghaberd the center of?
CREATE TABLE "see_also" (
  "province_ashkharh" text,
  "armenian_name" text,
  "area_km" real,
  "number_of_cantons_gavars" real,
  "center" text
);
SELECT COUNT("province_ashkharh") FROM "see_also" WHERE "center"='Baghaberd';