-er a-a a-b aaa aab aad aae aam aao aar ab- aba abb abd abe abm abo abr ad- ada adb add ade adm ado adr aea aeb aed aee aem aeo aer ama amb amd ame amm amo amr aoa aob aod aoe aom aoo aor ar- ara arb ard are arm aro arr baa bab bad bae bam bao bar bba bbb bbd bbe bbm bbo bbr bda bdb bdd bde bdm bdo bdr be- bea beb bed bee bem beo ber bma bmb bmd bme bmm bmo bmr boa bob bod boe bom boo bor bra brb brd bre brm bro brr daa dab dad dae dam dao dar dba dbb dbd dbe dbm dbo dbr dda ddb ddd dde ddm ddo ddr de- dea deb ded dee dem deo der dma dmb dmd dme dmm dmo dmr doa dob dod doe dom doo dor dra drb drd dre drm dro drr eaa eab ead eae eam eao ear eba ebb ebd ebe ebm ebo ebr ed- eda edb edd ede edm edo edr eea eeb eed eee eem eeo eer em- ema emb emd eme emm emo emr eo- eoa eob eod eoe eom eoo eor era erb erd ere erm ero err m-o m-r maa mab mad mae mam mao mar mba mbb mbd mbe mbm mbo mbr mda mdb mdd mde mdm mdo mdr mea meb med mee mem meo mer mma mmb mmd mme mmm mmo mmr moa mob mod moe mom moo mor mra mrb mrd mre mrm mro mrr oaa oab oad oae oam oao oar ob- oba obb obd obe obm obo obr oda odb odd ode odm odo odr oea oeb oed oee oem oeo oer om- oma omb omd ome omm omo omr oo- ooa oob ood oom ooo oor or- ora orb ord ore orm oro orr ra- raa rab rad rae ram rao rar rba rbb rbd rbe rbm rbo rbr rda rdb rdd rde rdm rdo rdr re- rea reb red ree rem reo rer rma rmb rmd rme rmm rmo rmr roa rob rod roe rom roo ror rra rrb rrd rrm rrr