-er a-a a-b aaa aab aad aae aam aao aar aas ab- aba abb abd abe abm abo abr abs ad- ada adb add ade adm ado adr ads aea aeb aed aee aem aeo aer aes ama amb amd ame amm amo amr ams aoa aob aod aoe aom aoo aor aos ar- ara arb ard are arm aro arr ars as- asa asb asd ase asm aso asr ass baa bab bad bae bam bao bar bas bba bbb bbd bbe bbm bbo bbr bbs bda bdb bdd bde bdm bdo bdr bds be- bea beb bed bee bem beo ber bes bma bmb bmd bme bmm bmo bmr bms boa bob bod boe bom boo bor bos bra brb brd bre brm bro brr brs bsa bsb bsd bse bsm bso bsr bss daa dab dad dae dam dao dar das dba dbb dbd dbe dbm dbo dbr dbs dda ddb ddd dde ddm ddo ddr dds de- dea deb ded dee dem deo der des dma dmb dmd dme dmm dmo dmr dms doa dob dod doe dom doo dor dos dra drb drd dre drm dro drr drs dsa dsb dsd dse dsm dso dsr dss eaa eab ead eae eam eao ear eas eba ebb ebd ebe ebm ebo ebr ebs ed- eda edb edd ede edm edo edr eds eea eeb eed eee eem eeo eer ees em- ema emb emd eme emm emo emr ems eo- eoa eob eod eoe eom eoo eor eos era erb erd ere erm ero err ers es- esa esb esd ese esm eso esr ess m-o m-r maa mab mad mae mam mao mar mas mba mbb mbd mbe mbm mbo mbr mbs mda mdb mdd mde mdm mdo mdr mds mea meb med mee mem meo mer mes mma mmb mmd mme mmm mmo mmr mms moa mob mod moe mom moo mor mos mra mrb mrd mre mrm mro mrr mrs msa msb msd mse msm mso msr mss oaa oab oad oae oam oao oar oas ob- oba obb obd obe obm obo obr obs oda odb odd ode odm odo odr ods oea oeb oed oee oem oeo oer oes om- oma omb omd ome omm omo omr oms oo- ooa oob ood oom ooo oor oos or- ora orb ord ore orm oro orr ors os- osa osb osd ose osm oso osr oss ra- raa rab rad rae ram rao rar ras rba rbb rbd rbe rbm rbo rbr rbs rda rdb rdd rde rdm rdo rdr rds re- rea reb red ree rem reo rer res rma rmb rmd rme rmm rmo rmr rms roa rob rod roe rom roo ror ros rra rrb rrd rrm rrr rrs rsa rsb rsd rse rsm rso rsr rss saa sab sad sae sam sao sar sas sba sbb sbd sbe sbm sbo sbr sbs sda sdb sdd sde sdm sdo sdr sds se- sea seb sed see sem seo ser ses sma smb smd sme smm smo smr sms soa sob sod soe som soo sor sos sr- sra srb srd sre srm sro srr srs ss- ssa ssb ssd sse ssm sso ssr sss