-er a-a a-b a-t aaa aab aad aae aam aan aar aat ab- aba abb abd abe abm abn abr abt ad- ada adb add ade adm adn adr adt aea aeb aed aee aem aen aer aet ama amb amd ame amm amn amr amt an- ana anb and ane anm ann anr ant ar- ara arb ard are arm arn arr art at- ata atb atd ate atm atn atr att baa bab bad bae bam ban bar bat bba bbb bbd bbe bbm bbn bbr bbt bda bdb bdd bde bdm bdr bdt be- bea beb bed bee bem ben ber bet bma bmb bmd bme bmm bmn bmr bmt bna bnb bnd bne bnn bnr bnt bra brb brd bre brm brn brr brt bta btb btd bte btm btn btr btt daa dab dad dae dam dan dar dat dba dbb dbd dbe dbm dbn dbr dbt dda ddb ddd dde ddm ddn ddr ddt de- dea deb ded dee dem den der det dma dmb dmd dme dmm dmn dmr dmt dna dnb dnd dne dnm dnn dnr dnt dra drb drd dre drm drn drr drt dta dtb dtd dte dtm dtn dtr dtt eaa eab ead eae eam ean ear eat eba ebb ebd ebe ebm ebn ebr ebt ed- eda edb edd ede edm edn edr edt eea eeb eed eee eem een eer eet em- ema emb emd eme emm emn emr emt en- ena enb end ene enm enn enr ent era erb erd ere erm ern err ert eta etb etd ete etm etn etr ett m-r maa mab mad mae mam man mar mat mba mbb mbd mbe mbm mbr mbt mda mdb mdd mde mdm mdn mdr mdt mea meb med mee mem men mer met mma mmb mmd mme mmm mmn mmr mmt mna mnb mne mnm mnn mnr mnt mra mrb mrd mre mrm mrn mrr mrt mta mtb mtd mte mtm mtn mtr mtt naa nab nad nae nam nan nar nat nba nbb nbd nbe nbm nbn nbr nbt nda ndb ndd nde ndm ndn ndr ndt ne- nea neb ned nee nem nen ner net nma nmb nmd nme nmm nmn nmr nmt nna nnb nne nnm nnn nnt nra nrb nrd nre nrm nrn nrr nrt nta ntb ntd nte ntm ntn ntr ntt ra- raa rab rad rae ram ran rar rat rba rbb rbd rbe rbm rbn rbr rbt rda rdb rdd rde rdm rdn rdr rdt re- rea reb red ree rem ren rer ret rma rmb rmd rme rmm rmn rmr rmt rna rnb rnd rnm rnn rnr rnt rra rrb rrd rrm rrn rrr rrt rta rtb rtd rte rtm rtn rtr rtt taa tab tad tae tam tan tar tat tba tbb tbd tbe tbm tbn tbr tbt tda tdb tdd tde tdm tdn tdr tdt te- tea teb ted tee tem ten ter tet tma tmb tmd tme tmm tmn tmr tmt tna tnb tnd tne tnm tnn tnr tnt tra trb trd tre trm trn trr trt tta ttb ttd tte ttm ttn ttr ttt