who is the common prime minster of william harer and william wedgwood benn ?
SELECT DISTINCT var_uri where brack_open dbr_William_Hare,_5th_Earl_of_Listowel dbo_primeMinister var_uri sep_dot dbr_William_Wedgwood_Benn,_1st_Viscount_Stansgate dbp_primeminister var_uri brack_close