roger nkodo dang and nkosazana dlamini-zuma are leaders of which place ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_leader dbr_Roger_Nkodo_Dang sep_dot var_uri dbo_leader dbr_Nkosazana_Dlamini-Zuma sep_dot var_uri a dbo_Place brack_close