a-a a-b a-c aaa aab aac aae aag aak aan aau ab- aba abb abc abe abg abk abn abu ac- aca acb acc ace acg ack acn acu aea aeb aec aee aeg aek aen aeu ag- aga agb agc age agg agk agn agu aka akb akc ake akg akk akn aku an- ana anb anc ane ang ank ann anu au- aua aub auc aue aug auk aun b-u baa bab bac bae bag bak ban bau bba bbb bbc bbe bbg bbk bbn bbu bca bcb bcc bce bcg bck bcn bcu be- bea beb bec bee beg bek ben beu bga bgb bgc bge bgg bgk bgn bgu bka bkb bkc bke bkg bkk bkn bna bnb bnc bne bng bnk bnn bnu bua bub buc bue bug buk bun buu c-- caa cab cac cae cag cak can cau cba cbb cbc cbe cbg cbk cbn cbu cca ccb ccc cce ccg cck ccn ccu ce- cea ceb cec cee ceg cek cen ceu cga cgb cgc cge cgg cgn cgu cka ckb ckc cn- cna cnb cnc cne cng cnn cnu cua cub cuc cue cug cuk cun cuu eaa eab eac eae eag eak ean eau eba ebb ebc ebe ebg ebk ebn ebu ec- eca ecb ecc ece ecg eck ecn ecu eea eeb eec eee eeg eek een ega egb egc ege egg egn egu eka ekb ekc eke ekg eku en- ena enb enc ene eng enk enn enu eu- eua eub euc eue eug eun gaa gab gac gae gag gak gan gau gba gbc gbe gbg gbk gbn gbu gca gcb gcc gce gcg gck gcn gcu ge- gea geb gec gee geg gek gen geu gga ggb ggc ggg ggn ggu gka gkb gkn gna gnb gnc gne gnn gnu gu- gua gub guc gue gug guk gun guu ka- kaa kab kac kae kag kak kan kau kba kbb kbc kbe kbk kbn kbu kca kcb kcc kce kcg kck kcn kcu ke- kea keb kec kee keg kek ken kga kgb kgc kgu kkb kkc kke kkk kkn kku kn- kna knc kne kng knk knn knu kub kuc kue kug kuk kun kuu naa nab nac nae nag nak nan nau nba nbb nbc nbe nbg nbk nbn nbu nca ncb ncc nce ncg nck ncn ncu ne- nea neb nec nee neg nek nen neu nga ngb ngc nge ngg ngk ngn ngu nka nkc nke nkk nkn nku nna nnb nnc nne nng nnk nnn nnu nua nub nuc nue nug nuk nun nuu ua- uaa uab uac uae uag uak uan uau uba ubb ubc ube ubg ubk ubn ubu uca ucb ucc uce ucg uck ucn ucu uea ueb uec uee ueg uen uga ugb ugc uge ugg ugk ugn ugu uka ukb ukc uke ukk ukn uku un- una unb unc une ung unk unn unu uua uuc uue uug uun uuu