rep rer res reu rkc rke rkk rko rkp rks rku rna rnc rnd rnn rno rnp rnr rns rnu roa roc rod roe rok ron roo rop ror ros rou rpa rpc rpd rpe rpk rpn rpo rpp rpr rps rpu rra rrc rrd rrk rrn rrp rrr rrs rru rsa rsc rsd rse rsk rsn rso rsp rsr rss rsu rua ruc rud rue ruk run ruo rup rur rus ruu saa sac sad sae sak san sao sap sar sas sau sca scc scd sce sck scn sco scp scr scs scu sda sdc sdd sde sdk sdn sdo sdp sdr sds sdu se- sea sec sed see sek sen seo sep ser ses seu sk- ska skc skd ske skk sko skp skr sks sku sna snc snd sne snk snn sno snp snr sns snu soa soc sod soe sok son soo sop sor sos sou spa spc spd spe spk spn spo spp spr sps spu sr- sra src srd sre srk srn sro srp srr srs ss- ssa ssc ssd sse ssk ssn sso ssp ssr sss ssu sua suc sud sue suk sun suo sup sur sus suu ua- uaa uac uad uae uak uan uao uap uar uas uau uca ucc ucd uce uck ucn uco ucp ucr ucs ucu uda udc udd ude udk udn udo udp udr uds udu uea uec ued uee uen uep uer ues uka ukc uke ukk ukn ukp ukr uku un- una unc und une unk unn uno unp unr uns unu uoa uoc uod uoe uok uon uoo uop uor uos up- upa upc upd upe upk upn upo upp upr ups upu ur- ura urc urd ure urk urn uro urp urr urs uru usa usc usd use usk usn uso usp usr uss usu uua uuc uue uun uur uus uuu