who is the common prime minster of archibald sinclairr and peter carington ?
SELECT DISTINCT var_uri where brack_open dbr_Archibald_Sinclair,_1st_Viscount_Thurso dbo_primeMinister var_uri sep_dot dbr_Peter_Carington,_6th_Baron_Carrington dbp_primeminister var_uri brack_close