a-a a-b a-c a-t aaa aab aac aae aak aan aat aau ab- aba abb abc abe abk abn abt abu ac- aca acb acc ace ack acn act acu aea aeb aec aee aek aen aet aeu aka akb akc ake akk akn aku an- ana anb anc ane ank ann ant anu at- ata atb atc ate atn att atu au- aua aub auc aue auk aun aut b-u baa bab bac bae bak ban bat bau bba bbb bbc bbe bbk bbn bbt bbu bca bcb bcc bce bck bcn bct bcu be- bea beb bec bee bek ben bet beu bka bkb bkc bke bkk bkn bkt bna bnb bnc bne bnk bnn bnt bnu bta btb btc bte btk btn btt btu bua bub buc bue buk bun but buu c-- caa cab cac cae cak can cat cau cba cbb cbc cbe cbk cbn cbt cbu cca ccb ccc cce cck ccn cct ccu ce- cea ceb cec cee cek cen cet ceu cka ckb ckc ckt cn- cna cnb cnc cne cnn cnt cnu cta ctb ctc cte ctk ctn ctt ctu cua cub cuc cue cuk cun cut cuu eaa eab eac eae eak ean eat eau eba ebb ebc ebe ebk ebn ebt ebu ec- eca ecb ecc ece eck ecn ect ecu eea eeb eec eee eek een eet eka ekb ekc eke ekt eku en- ena enb enc ene enk enn ent enu eta etb etc ete etk etn ett etu eu- eua eub euc eue eun eut k-t ka- kaa kab kac kae kak kan kat kau kba kbb kbc kbe kbk kbn kbu kca kcb kcc kce kck kcn kct kcu ke- kea keb kec kee kek ken ket kkb kkc kke kkk kkn kkt kku kn- kna knc kne knk knn knt knu kta ktb ktc kte ktk ktn ktt ktu kub kuc kue kuk kun kut kuu naa nab nac nae nak nan nat nau nba nbb nbc nbe nbk nbn nbt nbu nca ncb ncc nce nck ncn nct ncu ne- nea neb nec nee nek nen net neu nka nkc nke nkk nkn nkt nku nna nnb nnc nne nnk nnn nnt nnu nta ntb ntc nte ntk ntn ntt ntu nua nub nuc nue nuk nun nut nuu taa tab tac tae tak tan tat tau tba tbb tbc tbe tbk tbn tbt tbu tca tcb tcc tce tck tcn tct tcu te- tea teb tec tee tek ten tet teu tka tkb tkc tke tkk tkt tna tnb tnc tne tnk tnn tnt tta ttb ttc tte ttk ttn ttt ttu tua tub tuc tue tuk tun tut tuu ua- uaa uab uac uae uak uan uat uau uba ubb ubc ube ubk ubn ubt ubu uca ucb ucc uce uck ucn uct ucu uea ueb uec uee uen uet uka ukb ukc uke ukk ukn uku un- una unb unc une unk unn unt unu uta utb utc ute utk utn utt utu uua uuc uue uun uut uuu