re- rec red ree reg rei ren reo rep rer res reu rgc rgd rge rgg rgi rgn rgo rgp rgr rgs ric rid rie rig rii rin rio rip rir ris rnc rnd rng rni rnn rno rnp rnr rns rnu roc rod roe rog roi ron roo rop ror ros rou rpc rpd rpe rpg rpi rpn rpo rpp rpr rps rpu rrc rrd rrg rri rrn rrp rrr rrs rru rsc rsd rse rsg rsi rsn rso rsp rsr rss rsu ruc rud rue rug rui run ruo rup rur rus ruu scc scd sce scg sci scn sco scp scr scs scu sdc sdd sde sdg sdi sdn sdo sdp sdr sds sdu se- sec sed see seg sei sen seo sep ser ses seu sgc sgd sge sgg sgi sgn sgo sgp sgr sgs sgu sic sid sie sig sii sin sio sip sir sis siu snc snd sne sng sni snn sno snp snr sns snu soc sod soe sog soi son soo sop sor sos sou spc spd spe spg spi spn spo spp spr sps spu sr- src srd sre srg sri srn sro srp srr srs ss- ssc ssd sse ssg ssi ssn sso ssp ssr sss ssu suc sud sue sug sui sun suo sup sur sus suu ucc ucd uce ucg uci ucn uco ucp ucr ucs ucu udc udd ude udg udi udn udo udp udr uds udu uec ued uee ueg uei uen uep uer ues ugc uge ugg ugi ugn ugo ugp ugr ugs ugu uic uid uie uig uii uin uio uip uir uis uiu un- unc und une ung uni unn uno unp unr uns unu uoc uod uoe uog uon uoo uop uor uos up- upc upd upe upg upi upn upo upp upr ups upu ur- urc urd ure urg uri urn uro urp urr urs uru usc usd use usg usi usn uso usp usr uss usu uuc uue uug uun uur uus uuu