rcn rco rcp rcr rcs rcu rda rdc rdd rde rdg rdn rdo rdp rdr rds rdu re- rea rec red ree reg ren reo rep rer res reu rga rgc rgd rge rgg rgn rgo rgp rgr rgs rna rnc rnd rng rnn rno rnp rnr rns rnu roa roc rod roe rog ron roo rop ror ros rou rpa rpc rpd rpe rpg rpn rpo rpp rpr rps rpu rra rrc rrd rrg rrn rrp rrr rrs rru rsa rsc rsd rse rsg rsn rso rsp rsr rss rsu rua ruc rud rue rug run ruo rup rur rus ruu saa sac sad sae sag san sao sap sar sas sau sca scc scd sce scg scn sco scp scr scs scu sda sdc sdd sde sdg sdn sdo sdp sdr sds sdu se- sea sec sed see seg sen seo sep ser ses seu sga sgc sgd sge sgg sgn sgo sgp sgr sgs sgu sna snc snd sne sng snn sno snp snr sns snu soa soc sod soe sog son soo sop sor sos sou spa spc spd spe spg spn spo spp spr sps spu sr- sra src srd sre srg srn sro srp srr srs ss- ssa ssc ssd sse ssg ssn sso ssp ssr sss ssu sua suc sud sue sug sun suo sup sur sus suu ua- uaa uac uad uae uag uan uao uap uar uas uau uca ucc ucd uce ucg ucn uco ucp ucr ucs ucu uda udc udd ude udg udn udo udp udr uds udu uea uec ued uee ueg uen uep uer ues uga ugc uge ugg ugn ugo ugp ugr ugs ugu un- una unc und une ung unn uno unp unr uns unu uoa uoc uod uoe uog uon uoo uop uor uos up- upa upc upd upe upg upn upo upp upr ups upu ur- ura urc urd ure urg urn uro urp urr urs uru usa usc usd use usg usn uso usp usr uss usu uua uuc uue uug uun uur uus uuu