-er a-a a-b aaa aab aad aae aaf aam aao aar aas ab- aba abb abd abe abf abm abo abr abs ad- ada adb add ade adf adm ado adr ads aea aeb aed aee aef aem aeo aer aes af- afa afb afd afe aff afm afo afr afs ama amb amd ame amf amm amo amr ams aoa aob aod aoe aof aom aoo aor aos ar- ara arb ard are arf arm aro arr ars as- asa asb asd ase asf asm aso asr ass baa bab bad bae baf bam bao bar bas bba bbb bbd bbe bbf bbm bbo bbr bbs bda bdb bdd bde bdf bdm bdo bdr bds be- bea beb bed bee bef bem beo ber bes bfa bfb bfd bfe bff bfm bfo bfr bfs bma bmb bmd bme bmf bmm bmo bmr bms boa bob bod boe bof bom boo bor bos bra brb brd bre brf brm bro brr brs bsa bsb bsd bse bsf bsm bso bsr bss daa dab dad dae daf dam dao dar das dba dbb dbd dbe dbf dbm dbo dbr dbs dda ddb ddd dde ddf ddm ddo ddr dds de- dea deb ded dee def dem deo der des dfa dfb dfd dfe dff dfm dfo dfr dfs dma dmb dmd dme dmf dmm dmo dmr dms doa dob dod doe dof dom doo dor dos dra drb drd dre drm dro drr drs dsa dsb dsd dse dsf dsm dso dsr dss eaa eab ead eae eaf eam eao ear eas eba ebb ebd ebe ebf ebm ebo ebr ebs ed- eda edb edd ede edf edm edo edr eds eea eeb eed eee eef eem eeo eer ees ef- efa efb efd efe eff efm efo efr efs em- ema emb emd eme emf emm emo emr ems eo- eoa eob eod eoe eof eom eoo eor eos era erb erd ere erf erm ero err ers es- esa esb esd ese esf esm eso esr ess faa fab fad fae faf fam fao far fas fba fbb fbd fbe fbf fbm fbo fbr fbs fda fdb fdd fde fdf fdm fdo fdr fds fea feb fed fee fef fem feo fer fes ffa ffd ffe fff ffm ffo ffr ffs fma fmb fmd fme fmf fmm fmo fmr fms foa fob foe fof fom foo for fos fra frb frd fre frf frm fro frr frs fsa fsb fsd fse fsf fsm fso fsr fss m-f m-o m-r maa mab mad mae maf mam mao mar mas mba mbb mbd mbe mbf mbm mbo mbr mbs mda mdb mdd mde mdf mdm mdo mdr mds mea meb med mee mef mem meo mer mes mfa mfb mfd mfe mff mfm mfo mfr mfs mma mmb mmd mme mmf mmm mmo mmr mms moa mob mod moe mof mom moo mor mos mra mrb mrd mre mrf mrm mro mrr mrs msa msb msd mse msf msm mso msr mss oaa oab oad oae oaf oam oao oar oas ob- oba obb obd obe obf obm obo obr obs oda odb odd ode odf odm odo odr ods oea oeb oed oee oef oem oeo oer oes of- ofa ofb ofd ofe off ofm ofo ofr ofs om- oma omb omd ome omf omm omo omr oms oo- ooa oob ood oof oom ooo oor oos or- ora orb ord ore orf orm oro orr ors os- osa osb osd ose osf osm oso osr oss ra- raa rab rad rae raf ram rao rar ras rba rbb rbd rbe rbf rbm rbo rbr rbs rda rdb rdd rde rdf rdm rdo rdr rds re- rea reb red ree ref rem reo rer res rfa rfb rfd rfe rff rfm rfo rfr rfs rma rmb rmd rme rmf rmm rmo rmr rms roa rob rod roe rof rom roo ror ros rra rrb rrd rrf rrm rrr rrs rsa rsb rsd rse rsf rsm rso rsr rss saa sab sad sae saf sam sao sar sas sba sbb sbd sbe sbf sbm sbo sbr sbs sda sdb sdd sde sdf sdm sdo sdr sds se- sea seb sed see sef sem seo ser ses sfa sfb sfd sfe sff sfm sfo sfr sfs sma smb smd sme smf smm smo smr sms soa sob sod soe sof som soo sor sos sr- sra srb srd sre srf srm sro srr srs ss- ssa ssb ssd sse ssf ssm sso ssr sss