-er a-a a-c aaa aac aae aaf aam aao aar aas ac- aca acc ace acf acm aco acr acs aea aec aee aef aem aeo aer aes af- afa afc afe aff afm afo afr afs ama amc ame amf amm amo amr ams aoa aoc aoe aof aom aoo aor aos ar- ara arc are arf arm aro arr ars as- asa asc ase asf asm aso asr ass c-- caa cac cae caf cam cao car cas cca ccc cce ccf ccm cco ccr ccs ce- cea cec cee cef cem ceo cer ces cfa cfc cfe cff cfm cfo cfr cfs cma cmc cme cmf cmm cmo cmr cms co- coa coc coe cof com coo cor cos cra crc cre crf crm cro crr crs csa csc cse csf csm cso csr css eaa eac eae eaf eam eao ear eas ec- eca ecc ece ecf ecm eco ecr ecs eea eec eee eef eem eeo eer ees ef- efa efc efe eff efm efo efr efs em- ema emc eme emf emm emo emr ems eo- eoa eoc eoe eof eom eoo eor eos era erc ere erf erm ero err ers es- esa esc ese esf esm eso esr ess faa fac fae faf fam fao far fas fca fcc fce fcf fcm fco fcr fcs fea fec fee fef fem feo fer fes ffa ffc ffe fff ffm ffo ffr ffs fma fmc fme fmf fmm fmo fmr fms foa foc foe fof fom foo for fos fra frc fre frf frm fro frr frs fsa fsc fse fsf fsm fso fsr fss m-f m-o m-r maa mac mae maf mam mao mar mas mc- mca mcc mce mcf mcm mco mcr mcs mea mec mee mef mem meo mer mes mfa mfc mfe mff mfm mfo mfr mfs mma mmc mme mmf mmm mmo mmr mms moa moc moe mof mom moo mor mos mra mrc mre mrf mrm mro mrr mrs msa msc mse msf msm mso msr mss oaa oac oae oaf oam oao oar oas oc- oca occ ocf ocm oco ocr ocs oea oec oee oef oem oeo oer oes of- ofa ofc ofe off ofm ofo ofr ofs om- oma omc ome omf omm omo omr oms oo- ooa ooc oof oom ooo oor oos or- ora orc ore orf orm oro orr ors os- osa osc ose osf osm oso osr oss ra- raa rac rae raf ram rao rar ras rca rcc rce rcf rcm rco rcr rcs re- rea rec ree ref rem reo rer res rfa rfc rfe rff rfm rfo rfr rfs rma rmc rme rmf rmm rmo rmr rms roa roc roe rof rom roo ror ros rra rrc rrf rrm rrr rrs rsa rsc rse rsf rsm rso rsr rss saa sac sae saf sam sao sar sas sca scc sce scf scm sco scr scs se- sea sec see sef sem seo ser ses sfa sfc sfe sff sfm sfo sfr sfs sma smc sme smf smm smo smr sms soa soc soe sof som soo sor sos sr- sra src sre srf srm sro srr srs ss- ssa ssc sse ssf ssm sso ssr sss