a-a a-b a-c aaa aab aac aae aag aan aau ab- aba abb abc abe abg abn abu ac- aca acb acc ace acg acn acu aea aeb aec aee aeg aen aeu ag- aga agb agc age agg agn agu an- ana anb anc ane ang ann anu au- aua aub auc aue aug aun b-u baa bab bac bae bag ban bau bba bbb bbc bbe bbg bbn bbu bca bcb bcc bce bcg bcn bcu be- bea beb bec bee beg ben beu bga bgb bgc bge bgg bgn bgu bna bnb bnc bne bng bnn bnu bua bub buc bue bug bun buu c-- caa cab cac cae cag can cau cba cbb cbc cbe cbg cbn cbu cca ccb ccc cce ccg ccn ccu ce- cea ceb cec cee ceg cen ceu cga cgb cgc cge cgg cgn cgu cn- cna cnb cnc cne cng cnn cnu cua cub cuc cue cug cun cuu eaa eab eac eae eag ean eau eba ebb ebc ebe ebg ebn ebu ec- eca ecb ecc ece ecg ecn ecu eea eeb eec eee eeg een ega egb egc ege egg egn egu en- ena enb enc ene eng enn enu eu- eua eub euc eue eug eun gaa gab gac gae gag gan gau gba gbc gbe gbg gbn gbu gca gcb gcc gce gcg gcn gcu ge- gea geb gec gee geg gen geu gga ggb ggc ggg ggn ggu gna gnb gnc gne gnn gnu gu- gua gub guc gue gug gun guu naa nab nac nae nag nan nau nba nbb nbc nbe nbg nbn nbu nca ncb ncc nce ncg ncn ncu ne- nea neb nec nee neg nen neu nga ngb ngc nge ngg ngn ngu nna nnb nnc nne nng nnn nnu nua nub nuc nue nug nun nuu ua- uaa uab uac uae uag uan uau uba ubb ubc ube ubg ubn ubu uca ucb ucc uce ucg ucn ucu uea ueb uec uee ueg uen uga ugb ugc uge ugg ugn ugu un- una unb unc une ung unn unu uua uuc uue uug uun uuu