oc- oca occ ocf ocg oci ocm ocn oco ocr ocs oea oec oee oef oeg oei oem oen oeo oer oes of- ofa ofc ofe off ofg ofi ofm ofn ofo ofr ofs oga ogc oge ogf ogg ogi ogn ogo ogs oia oic oie oif oii oim oin oio oir ois om- oma omc ome omf omg omi omm omn omo omr oms on- ona onc one onf ong oni onn ono onr ons oo- ooa ooc oof oog ooi oom oon ooo oor oos or- ora orc ore orf org ori orm orn oro orr ors os- osa osc ose osf osg osi osm osn oso osr oss ra- raa rac rae raf rag rai ram ran rao rar ras rca rcc rce rcf rcg rci rcm rcn rco rcr rcs re- rea rec ree ref reg rei rem ren reo rer res rfa rfc rfe rff rfg rfi rfm rfn rfo rfr rfs rga rgc rge rgf rgg rgi rgn rgo rgr rgs ria ric rie rif rig rii rim rin rio rir ris rma rmc rme rmf rmg rmi rmm rmn rmo rmr rms rna rnc rng rni rnm rnn rno rnr rns roa roc roe rof rog roi rom ron roo ror ros rra rrc rrf rrg rri rrm rrn rrr rrs rsa rsc rse rsf rsg rsi rsm rsn rso rsr rss saa sac sae saf sag sai sam san sao sar sas sca scc sce scf scg sci scm scn sco scr scs se- sea sec see sef seg sei sem sen seo ser ses sfa sfc sfe sff sfg sfi sfm sfn sfo sfr sfs sga sgc sge sgf sgg sgi sgm sgn sgo sgr sgs sia sic sie sif sig sii sim sin sio sir sis sma smc sme smf smg smi smm smn smo smr sms sna snc sne snf sng sni snm snn sno snr sns soa soc soe sof sog soi som son soo sor sos sr- sra src sre srf srg sri srm srn sro srr srs ss- ssa ssc sse ssf ssg ssi ssm ssn sso ssr sss