nnnn nnos nnss non- nonn nono nons noo- noon nooo noor noos noov nor- norn noro norr nors norv nos- noss nov- novo nron nrsv nsnr nsos nsso nssr nsss nvss onno onon onor onos onso oons oooo ooos orno orns oro- oron oror oros orro orrs orso orvr orvs osno osnr osoo osor osos osov osro osso ovo- ovon ovoo rono rons roon roor roos roro roso ross rovo rovs rrrr rsnn rsno rsnr rsos s-os snns snoo snor snos snov snrs son- sono sons soon soor soos sorn soro sorr sors soso soss sosv sovo sovs srnn srno sros srvn ssns ssrs ssss svns svor vnso vonn vons voor vor- voro vors voso voss vrnn vron vvvv