rch rcn rco rcp rcr rcs rcu rda rdb rdc rdd rdh rdn rdo rdp rdr rds rdu rh- rha rhb rhc rhd rhh rhn rho rhp rhr rhs rhu rna rnb rnc rnd rnh rnn rno rnp rnr rns rnu roa rob roc rod roh ron roo rop ror ros rou rpa rpb rpc rpd rph rpn rpo rpp rpr rps rpu rra rrb rrc rrd rrh rrn rrp rrr rrs rru rsa rsb rsc rsd rsh rsn rso rsp rsr rss rsu rua rub ruc rud ruh run ruo rup rur rus ruu saa sab sac sad sah san sao sap sar sas sau sba sbb sbc sbd sbh sbn sbo sbp sbr sbs sbu sca scb scc scd sch scn sco scp scr scs scu sda sdb sdc sdd sdh sdn sdo sdp sdr sds sdu sh- sha shb shc shd shh shn sho shp shr shs shu sna snb snc snd snn sno snp snr sns snu soa sob soc sod soh son soo sop sor sos sou spa spb spc spd sph spn spo spp spr sps spu sr- sra srb src srd srh srn sro srp srr srs ss- ssa ssb ssc ssd ssh ssn sso ssp ssr sss ssu sua sub suc sud suh sun suo sup sur sus suu ua- uaa uab uac uad uah uan uao uap uar uas uau uba ubb ubc ubh ubn ubo ubp ubr ubs ubu uca ucb ucc ucd uch ucn uco ucp ucr ucs ucu uda udb udc udd udn udo udp udr uds udu uha uhb uhc uhd uhh uho uhp uhr uhs uhu un- una unb unc und unh unn uno unp unr uns unu uoa uob uoc uod uon uoo uop uor uos up- upa upb upc upd uph upn upo upp upr ups upu ur- ura urb urc urd urn uro urp urr urs uru usa usb usc usd ush usn uso usp usr uss usu uua uuc uun uur uus uuu