who is the common prime minster of w . averell harrimanr and william wedgwood benn ?
SELECT DISTINCT var_uri where brack_open dbr_W._Averell_Harriman dbo_primeMinister var_uri sep_dot dbr_William_Wedgwood_Benn,_1st_Viscount_Stansgate dbp_primeminister var_uri brack_close