rko rks rku rna rnc rnd rni rnn rno rnr rns rnu roa roc rod rof roi rok ron roo ror ros rou rra rrc rrd rrf rri rrk rrn rrr rrs rru rsa rsc rsd rsf rsi rsk rsn rso rsr rss rsu rua ruc rud ruf rui ruk run ruo rur rus ruu saa sac sad saf sai sak san sao sar sas sau sca scc scd scf sci sck scn sco scr scs scu sda sdc sdd sdf sdi sdk sdn sdo sdr sds sdu sfa sfc sfd sff sfi sfk sfn sfo sfr sfs sfu sia sic sid sif sii sik sin sio sir sis siu sk- ska skc skd skf ski skk sko skr sks sku sna snc snd snf sni snk snn sno snr sns snu soa soc sod sof soi sok son soo sor sos sou sr- sra src srd srf sri srk srn sro srr srs ss- ssa ssc ssd ssf ssi ssk ssn sso ssr sss ssu sua suc sud suf sui suk sun suo sur sus suu ua- uaa uac uad uaf uai uak uan uao uar uas uau uca ucc ucd ucf uci uck ucn uco ucr ucs ucu uda udc udd udf udi udk udn udo udr uds udu ufa ufc ufd uff ufi ufn ufo ufr ufs ufu uia uic uid uif uii uin uio uir uis uiu uka ukc ukf uki ukk ukn ukr uku un- una unc und unf uni unk unn uno unr uns unu uoa uoc uod uok uon uoo uor uos ur- ura urc urd urf uri urk urn uro urr urs uru usa usc usd usf usi usk usn uso usr uss usu uua uuc uun uur uus uuu