name the office holder whose predecessor is george douglas-hamilton and successor is archibald acheson ?
SELECT DISTINCT var_uri where brack_open var_uri dbp_predecessor dbr_George_Douglas-Hamilton,_10th_Earl_of_Selkirk sep_dot var_uri dbp_successor dbr_Archibald_Acheson,_6th_Earl_of_Gosford sep_dot var_uri a dbo_OfficeHolder brack_close