rfb rfd rff rfg rfi rfn rfo rfr rfs rfu rga rgb rgd rgf rgg rgi rgn rgo rgr rgs ria rib rid rif rig rii rin rio rir ris rna rnb rnd rng rni rnn rno rnr rns rnu roa rob rod rof rog roi ron roo ror ros rou rra rrb rrd rrf rrg rri rrn rrr rrs rru rsa rsb rsd rsf rsg rsi rsn rso rsr rss rsu rua rub rud ruf rug rui run ruo rur rus ruu saa sab sad saf sag sai san sao sar sas sau sba sbb sbd sbf sbg sbi sbn sbo sbr sbs sbu sda sdb sdd sdf sdg sdi sdn sdo sdr sds sdu sfa sfb sfd sff sfg sfi sfn sfo sfr sfs sfu sga sgb sgd sgf sgg sgi sgn sgo sgr sgs sgu sia sib sid sif sig sii sin sio sir sis siu sna snb snd snf sng sni snn sno snr sns snu soa sob sod sof sog soi son soo sor sos sou sr- sra srb srd srf srg sri srn sro srr srs ss- ssa ssb ssd ssf ssg ssi ssn sso ssr sss ssu sua sub sud suf sug sui sun suo sur sus suu ua- uaa uab uad uaf uag uai uan uao uar uas uau uba ubb ubf ubg ubi ubn ubo ubr ubs ubu uda udb udd udf udg udi udn udo udr uds udu ufa ufd uff ufg ufi ufn ufo ufr ufs ufu uga ugb ugf ugg ugi ugn ugo ugr ugs ugu uia uib uid uif uig uii uin uio uir uis uiu un- una unb und unf ung uni unn uno unr uns unu uoa uob uod uog uon uoo uor uos ur- ura urb urd urf urg uri urn uro urr urs uru usa usb usd usf usg usi usn uso usr uss usu uua uug uun uur uus uuu