name the office holder whose predecessor is george douglas-hamilton and successor is richard nugent ?
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_Richard_Nugent,_Baron_Nugent_of_Guildford sep_dot var_uri a dbo_OfficeHolder brack_close