a-a a-b a-c aaa aab aac aam aan aau ab- aba abb abc abm abn abu ac- aca acb acc acm acn acu ama amb amc amm amn amu an- ana anb anc anm ann anu au- aua aub auc aum aun b-u baa bab bac bam ban bau bba bbb bbc bbm bbn bbu bca bcb bcc bcm bcn bcu bma bmb bmc bmm bmn bmu bna bnb bnc bnn bnu bua bub buc bum bun buu c-- caa cab cac cam can cau cba cbb cbc cbm cbn cbu cca ccb ccc ccm ccn ccu cma cmb cmc cmm cmn cmu cn- cna cnb cnc cnm cnn cnu cua cub cuc cum cun cuu maa mab mac mam man mau mba mbb mbc mbm mbu mc- mca mcb mcc mcm mcn mcu mma mmb mmc mmm mmn mmu mna mnb mnc mnm mnn mnu mua mub muc mum mun muu naa nab nac nam nan nau nba nbb nbc nbm nbn nbu nca ncb ncc ncm ncn ncu nma nmb nmc nmm nmn nmu nna nnb nnc nnm nnn nnu nua nub nuc num nun nuu ua- uaa uab uac uam uan uau uba ubb ubc ubn ubu uca ucb ucc ucm ucn ucu um- uma umb umc umm umn umu un- una unb unc unm unn unu uua uuc uum uun uuu