a-a a-b aaa aab aae aam aan aau ab- aba abb abe abm abn abu aea aeb aee aem aen aeu ama amb ame amm amn amu an- ana anb ane anm ann anu au- aua aub aue aum aun b-u baa bab bae bam ban bau bba bbb bbe bbm bbn bbu be- bea beb bee bem ben beu bma bmb bme bmm bmn bmu bna bnb bne bnn bnu bua bub bue bum bun buu eaa eab eae eam ean eau eba ebb ebe ebm ebn ebu eea eeb eee eem een em- ema emb eme emm emn emu en- ena enb ene enm enn enu eu- eua eub eue eun maa mab mae mam man mau mba mbb mbe mbm mbu mea meb mee mem men meu mma mmb mme mmm mmn mmu mna mnb mne mnm mnn mnu mua mub mue mum mun muu naa nab nae nam nan nau nba nbb nbe nbm nbn nbu ne- nea neb nee nem nen neu nma nmb nme nmm nmn nmu nna nnb nne nnm nnn nnu nua nub nue num nun nuu ua- uaa uab uae uam uan uau uba ubb ube ubn ubu uea ueb uee uem uen um- uma umb ume umm umn umu un- una unb une unm unn unu uua uue uum uun uuu