-er a-a a-b aaa aab aae aam aan aar aav ab- aba abb abe abm abn abr abv aea aeb aee aem aen aer aev ama amb ame amm amn amr amv an- ana anb ane anm ann anr anv ar- ara arb are arm arn arr arv av- ava avb ave avm avn avr baa bab bae bam ban bar bav bba bbb bbe bbm bbn bbr be- bea beb bee bem ben ber bev bma bmb bme bmm bmn bmr bmv bna bnb bne bnn bnr bnv bra brb bre brm brn brr brv bva bvb bve bvm bvn bvr bvv eaa eab eae eam ean ear eav eba ebb ebe ebm ebn ebr ebv eea eeb eee eem een eer eev em- ema emb eme emm emn emr emv en- ena enb ene enm enn enr env era erb ere erm ern err erv eva evb eve evm evn evr evv m-r m-v maa mab mae mam man mar mav mba mbb mbe mbm mbr mbv mea meb mee mem men mer mev mma mmb mme mmm mmn mmr mmv mna mnb mne mnm mnn mnr mra mrb mre mrm mrn mrr mrv mva mvb mve mvm mvn mvr mvv naa nab nae nam nan nar nav nba nbb nbe nbm nbn nbr nbv ne- nea neb nee nem nen ner nev nma nmb nme nmm nmn nmr nna nnb nne nnm nnn nnv nra nrb nre nrm nrn nrr nrv nva nvb nve nvm nvn nvv ra- raa rab rae ram ran rar rav rba rbb rbe rbm rbn rbr re- rea reb ree rem ren rer rev rma rmb rme rmm rmn rmr rmv rna rnb rnm rnn rnr rnv rra rrb rrm rrn rrr rva rvb rve rvm rvn rvr rvv v-a v-e vaa vab vae vam van var vav vba vbm vbr vbv vea veb vee vem ven ver vm- vma vmm vmn vmr vn- vna vnm vnr vnv vra vrb vre vrm vrn vrr vva vvb vvm vvr vvv