a-a a-b a-c aaa aab aac aae aam aan aau ab- aba abb abc abe abm abn abu ac- aca acb acc ace acm acn acu aea aeb aec aee aem aen aeu ama amb amc ame amm amn amu an- ana anb anc ane anm ann anu au- aua aub auc aue aum aun b-u baa bab bac bae bam ban bau bba bbb bbc bbe bbm bbn bbu bca bcb bcc bce bcm bcn bcu be- bea beb bec bee bem ben beu bma bmb bmc bme bmm bmn bmu bna bnb bnc bne bnn bnu bua bub buc bue bum bun buu c-- caa cab cac cae cam can cau cba cbb cbc cbe cbm cbn cbu cca ccb ccc cce ccm ccn ccu ce- cea ceb cec cee cem cen ceu cma cmb cmc cme cmm cmn cmu cn- cna cnb cnc cne cnm cnn cnu cua cub cuc cue cum cun cuu eaa eab eac eae eam ean eau eba ebb ebc ebe ebm ebn ebu ec- eca ecb ecc ece ecm ecn ecu eea eeb eec eee eem een em- ema emb emc eme emm emn emu en- ena enb enc ene enm enn enu eu- eua eub euc eue eun maa mab mac mae mam man mau mba mbb mbc mbe mbm mbu mc- mca mcb mcc mce mcm mcn mcu mea meb mec mee mem men meu mma mmb mmc mme mmm mmn mmu mna mnb mnc mne mnm mnn mnu mua mub muc mue mum mun muu naa nab nac nae nam nan nau nba nbb nbc nbe nbm nbn nbu nca ncb ncc nce ncm ncn ncu ne- nea neb nec nee nem nen neu nma nmb nmc nme nmm nmn nmu nna nnb nnc nne nnm nnn nnu nua nub nuc nue num nun nuu ua- uaa uab uac uae uam uan uau uba ubb ubc ube ubn ubu uca ucb ucc uce ucm ucn ucu uea ueb uec uee uem uen um- uma umb umc ume umm umn umu un- una unb unc une unm unn unu uua uuc uue uum uun uuu