rca rcc rcd rcg rci rcn rco rcp rcr rcs rcu rda rdc rdd rdg rdi rdn rdo rdp rdr rds rdu rga rgc rgd rgg rgi rgn rgo rgp rgr rgs ria ric rid rig rii rin rio rip rir ris rna rnc rnd rng rni rnn rno rnp rnr rns rnu roa roc rod rog roi ron roo rop ror ros rou rpa rpc rpd rpg rpi rpn rpo rpp rpr rps rpu rra rrc rrd rrg rri rrn rrp rrr rrs rru rsa rsc rsd rsg rsi rsn rso rsp rsr rss rsu rua ruc rud rug rui run ruo rup rur rus ruu saa sac sad sag sai san sao sap sar sas sau sca scc scd scg sci scn sco scp scr scs scu sda sdc sdd sdg sdi sdn sdo sdp sdr sds sdu sga sgc sgd sgg sgi sgn sgo sgp sgr sgs sgu sia sic sid sig sii sin sio sip sir sis siu sna snc snd sng sni snn sno snp snr sns snu soa soc sod sog soi son soo sop sor sos sou spa spc spd spg spi spn spo spp spr sps spu sr- sra src srd srg sri srn sro srp srr srs ss- ssa ssc ssd ssg ssi ssn sso ssp ssr sss ssu sua suc sud sug sui sun suo sup sur sus suu ua- uaa uac uad uag uai uan uao uap uar uas uau uca ucc ucd ucg uci ucn uco ucp ucr ucs ucu uda udc udd udg udi udn udo udp udr uds udu uga ugc ugg ugi ugn ugo ugp ugr ugs ugu uia uic uid uig uii uin uio uip uir uis uiu un- una unc und ung uni unn uno unp unr uns unu uoa uoc uod uog uon uoo uop uor uos up- upa upc upd upg upi upn upo upp upr ups upu ur- ura urc urd urg uri urn uro urp urr urs uru usa usc usd usg usi usn uso usp usr uss usu uua uuc uug uun uur uus uuu