khalifa bin salman al khalifa and khalifa bin salman al khalifa are leaders of which place ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_leader dbr_Khalifa_bin_Salman_Al_Khalifa sep_dot var_uri dbo_leader dbr_Khalifa_bin_Salman_Al_Khalifa sep_dot var_uri a dbo_Place brack_close