CREATE TABLE table_201_43 (id DECIMAL, "name" TEXT, "canton" TEXT, "district" TEXT, "area\ ( km2 ) " DECIMAL, "population\ ( as of 2005 ) " DECIMAL, "date of law" TEXT)

which canton falls under the date of law of 24 february 1843 and has a population of 3,966 ?
SELECT "canton" FROM table_201_43 WHERE "date of law" = '24 february 1843' AND "population\n(as of 2005)" = '3966'
SELECT "canton" FROM "table_201_43" WHERE "date of law" = '24 february 1843' AND "population\n(as of 2005)" = '3966'