khalifa bin zayed al nahyan and mohammed bin rashid al maktoum are leaders of which place ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_leader dbr_Khalifa_bin_Zayed_Al_Nahyan sep_dot var_uri dbo_leader dbr_Mohammed_bin_Rashid_Al_Maktoum sep_dot var_uri a dbo_Place brack_close