"Hukou system" . . . "Hukou" . . "Household" . . "permanent population" . "governmental residential certificates for long-term residence" . "households" . "Hukou" . "''hukou'' system" . "''huji'' population" . "reside or previously resided" . "household registration" . . "Household Registration Book" . "Residential" . "permanent resident" . . "registered" . . "registered population" . . "hukou and other supporting documents." . . "hukou" . "the content of the household register" . . "household registrations" .