a-a a-b a-c a-t aaa aab aac aae aan aao aat aau ab- aba abb abc abe abn abo abt abu ac- aca acb acc ace acn aco act acu aea aeb aec aee aen aeo aet aeu an- ana anb anc ane ann ano ant anu aoa aob aoc aoe aon aoo aot aou at- ata atb atc ate atn ato att atu au- aua aub auc aue aun auo aut b-u baa bab bac bae ban bao bat bau bba bbb bbc bbe bbn bbo bbt bbu bca bcb bcc bce bcn bco bct bcu be- bea beb bec bee ben beo bet beu bna bnb bnc bne bnn bno bnt bnu boa bob boc boe bon boo bot bou bta btb btc bte btn bto btt btu bua bub buc bue bun buo but buu c-- caa cab cac cae can cao cat cau cba cbb cbc cbe cbn cbo cbt cbu cca ccb ccc cce ccn cco cct ccu ce- cea ceb cec cee cen ceo cet ceu cn- cna cnb cnc cne cnn cno cnt cnu co- coa cob coc coe con coo cot cou cta ctb ctc cte ctn cto ctt ctu cua cub cuc cue cun cuo cut cuu eaa eab eac eae ean eao eat eau eba ebb ebc ebe ebn ebo ebt ebu ec- eca ecb ecc ece ecn eco ect ecu eea eeb eec eee een eeo eet en- ena enb enc ene enn eno ent enu eo- eoa eob eoc eoe eon eoo eot eou eta etb etc ete etn eto ett etu eu- eua eub euc eue eun eut naa nab nac nae nan nao nat nau nba nbb nbc nbe nbn nbo nbt nbu nca ncb ncc nce ncn nco nct ncu ne- nea neb nec nee nen neo net neu nna nnb nnc nne nnn nno nnt nnu no- noa nob noc noe non noo not nou nta ntb ntc nte ntn nto ntt ntu nua nub nuc nue nun nuo nut nuu oaa oab oac oae oan oao oat oau ob- oba obb obc obe obn obo obt obu oc- oca ocb occ ocn oco oct ocu oea oeb oec oee oen oeo oet on- ona onb onc one onn ono ont onu oo- ooa oob ooc oon ooo oot ot- ota otb otc ote otn oto ott otu ou- oua ouc oue oun ouo out taa tab tac tae tan tao tat tau tba tbb tbc tbe tbn tbo tbt tbu tca tcb tcc tce tcn tco tct tcu te- tea teb tec tee ten teo tet teu tna tnb tnc tne tnn tno tnt to- toa tob toc toe ton too tot tou tta ttb ttc tte ttn tto ttt ttu tua tub tuc tue tun tuo tut tuu ua- uaa uab uac uae uan uao uat uau uba ubb ubc ube ubn ubo ubt ubu uca ucb ucc uce ucn uco uct ucu uea ueb uec uee uen uet un- una unb unc une unn uno unt unu uoa uob uoc uoe uon uoo uot uta utb utc ute utn uto utt utu uua uuc uue uun uut uuu