-er a-a a-b a-t aaa aab aad aae aam aao aar aat ab- aba abb abd abe abm abo abr abt ad- ada adb add ade adm ado adr adt aea aeb aed aee aem aeo aer aet ama amb amd ame amm amo amr amt aoa aob aod aoe aom aoo aor aot ar- ara arb ard are arm aro arr art at- ata atb atd ate atm ato atr att baa bab bad bae bam bao bar bat bba bbb bbd bbe bbm bbo bbr bbt bda bdb bdd bde bdm bdo bdr bdt be- bea beb bed bee bem beo ber bet bma bmb bmd bme bmm bmo bmr bmt boa bob bod boe bom boo bor bot bra brb brd bre brm bro brr brt bta btb btd bte btm bto btr btt daa dab dad dae dam dao dar dat dba dbb dbd dbe dbm dbo dbr dbt dda ddb ddd dde ddm ddo ddr ddt de- dea deb ded dee dem deo der det dma dmb dmd dme dmm dmo dmr dmt doa dob dod doe dom doo dor dot dra drb drd dre drm dro drr drt dta dtb dtd dte dtm dto dtr dtt eaa eab ead eae eam eao ear eat eba ebb ebd ebe ebm ebo ebr ebt ed- eda edb edd ede edm edo edr edt eea eeb eed eee eem eeo eer eet em- ema emb emd eme emm emo emr emt eo- eoa eob eod eoe eom eoo eor eot era erb erd ere erm ero err ert eta etb etd ete etm eto etr ett m-o m-r maa mab mad mae mam mao mar mat mba mbb mbd mbe mbm mbo mbr mbt mda mdb mdd mde mdm mdo mdr mdt mea meb med mee mem meo mer met mma mmb mmd mme mmm mmo mmr mmt moa mob mod moe mom moo mor mot mra mrb mrd mre mrm mro mrr mrt mta mtb mtd mte mtm mto mtr mtt oaa oab oad oae oam oao oar oat ob- oba obb obd obe obm obo obr obt oda odb odd ode odm odo odr odt oea oeb oed oee oem oeo oer oet om- oma omb omd ome omm omo omr omt oo- ooa oob ood oom ooo oor oot or- ora orb ord ore orm oro orr ort ot- ota otb otd ote otm oto otr ott ra- raa rab rad rae ram rao rar rat rba rbb rbd rbe rbm rbo rbr rbt rda rdb rdd rde rdm rdo rdr rdt re- rea reb red ree rem reo rer ret rma rmb rmd rme rmm rmo rmr rmt roa rob rod roe rom roo ror rot rra rrb rrd rrm rrr rrt rta rtb rtd rte rtm rto rtr rtt taa tab tad tae tam tao tar tat tba tbb tbd tbe tbm tbo tbr tbt tda tdb tdd tde tdm tdo tdr tdt te- tea teb ted tee tem teo ter tet tma tmb tmd tme tmm tmo tmr tmt to- toa tob tod toe tom too tor tot tra trb trd tre trm tro trr trt tta ttb ttd tte ttm tto ttr ttt