-er a-a a-b aaa aab aad aae aam aan aar ab- aba abb abd abe abm abn abr ad- ada adb add ade adm adn adr aea aeb aed aee aem aen aer ama amb amd ame amm amn amr an- ana anb and ane anm ann anr ar- ara arb ard are arm arn arr baa bab bad bae bam ban bar bba bbb bbd bbe bbm bbn bbr bda bdb bdd bde bdm bdr be- bea beb bed bee bem ben ber bma bmb bmd bme bmm bmn bmr bna bnb bnd bne bnn bnr bra brb brd bre brm brn brr daa dab dad dae dam dan dar dba dbb dbd dbe dbm dbn dbr dda ddb ddd dde ddm ddn ddr de- dea deb ded dee dem den der dma dmb dmd dme dmm dmn dmr dna dnb dnd dne dnm dnn dnr dra drb drd dre drm drn drr eaa eab ead eae eam ean ear eba ebb ebd ebe ebm ebn ebr ed- eda edb edd ede edm edn edr eea eeb eed eee eem een eer em- ema emb emd eme emm emn emr en- ena enb end ene enm enn enr era erb erd ere erm ern err m-r maa mab mad mae mam man mar mba mbb mbd mbe mbm mbr mda mdb mdd mde mdm mdn mdr mea meb med mee mem men mer mma mmb mmd mme mmm mmn mmr mna mnb mne mnm mnn mnr mra mrb mrd mre mrm mrn mrr naa nab nad nae nam nan nar nba nbb nbd nbe nbm nbn nbr nda ndb ndd nde ndm ndn ndr ne- nea neb ned nee nem nen ner nma nmb nmd nme nmm nmn nmr nna nnb nne nnm nnn nra nrb nrd nre nrm nrn nrr ra- raa rab rad rae ram ran rar rba rbb rbd rbe rbm rbn rbr rda rdb rdd rde rdm rdn rdr re- rea reb red ree rem ren rer rma rmb rmd rme rmm rmn rmr rna rnb rnd rnm rnn rnr rra rrb rrd rrm rrn rrr