rdn rdo rdp rdr rds rdu re- rea red ree ref rei ren reo rep rer res reu rfa rfd rfe rff rfi rfn rfo rfp rfr rfs rfu ria rid rie rif rii rin rio rip rir ris rna rnd rni rnn rno rnp rnr rns rnu roa rod roe rof roi ron roo rop ror ros rou rpa rpd rpe rpf rpi rpn rpo rpp rpr rps rpu rra rrd rrf rri rrn rrp rrr rrs rru rsa rsd rse rsf rsi rsn rso rsp rsr rss rsu rua rud rue ruf rui run ruo rup rur rus ruu saa sad sae saf sai san sao sap sar sas sau sda sdd sde sdf sdi sdn sdo sdp sdr sds sdu se- sea sed see sef sei sen seo sep ser ses seu sfa sfd sfe sff sfi sfn sfo sfp sfr sfs sfu sia sid sie sif sii sin sio sip sir sis siu sna snd sne snf sni snn sno snp snr sns snu soa sod soe sof soi son soo sop sor sos sou spa spd spe spf spi spn spo spp spr sps spu sr- sra srd sre srf sri srn sro srp srr srs ss- ssa ssd sse ssf ssi ssn sso ssp ssr sss ssu sua sud sue suf sui sun suo sup sur sus suu ua- uaa uad uae uaf uai uan uao uap uar uas uau uda udd ude udf udi udn udo udp udr uds udu uea ued uee uef uei uen uep uer ues ufa ufd ufe uff ufi ufn ufo ufp ufr ufs ufu uia uid uie uif uii uin uio uip uir uis uiu un- una und une unf uni unn uno unp unr uns unu uoa uod uoe uon uoo uop uor uos up- upa upd upe upf upi upn upo upp upr ups upu ur- ura urd ure urf uri urn uro urp urr urs uru usa usd use usf usi usn uso usp usr uss usu uua uue uun uur uus uuu