a-a a-b a-c a-t aaa aab aac aae aaf aao aat aau ab- aba abb abc abe abf abo abt abu ac- aca acb acc ace acf aco act acu aea aeb aec aee aef aeo aet aeu af- afa afb afc afe aff afo aft afu aoa aob aoc aoe aof aoo aot aou at- ata atb atc ate atf ato att atu au- aua aub auc aue auf auo aut b-u baa bab bac bae baf bao bat bau bba bbb bbc bbe bbf bbo bbt bbu bca bcb bcc bce bcf bco bct bcu be- bea beb bec bee bef beo bet beu bfa bfb bfc bfe bff bfo bft bfu boa bob boc boe bof boo bot bou bta btb btc bte btf bto btt btu bua bub buc bue buf buo but buu c-- caa cab cac cae caf cao cat cau cba cbb cbc cbe cbf cbo cbt cbu cca ccb ccc cce ccf cco cct ccu ce- cea ceb cec cee cef ceo cet ceu cfa cfb cfc cfe cff cfo cft cfu co- coa cob coc coe cof coo cot cou cta ctb ctc cte ctf cto ctt ctu cua cub cuc cue cuf cuo cut cuu eaa eab eac eae eaf eao eat eau eba ebb ebc ebe ebf ebo ebt ebu ec- eca ecb ecc ece ecf eco ect ecu eea eeb eec eee eef eeo eet ef- efa efb efc efe eff efo eft eo- eoa eob eoc eoe eof eoo eot eou eta etb etc ete etf eto ett etu eu- eua eub euc eue euf eut faa fab fac fae faf fao fat fau fba fbb fbc fbe fbf fbo fbt fbu fca fcb fcc fce fcf fco fct fcu fea feb fec fee fef feo fet feu ffa ffc ffe fff ffo fft ffu foa fob foc foe fof foo fot fou fta ftb ftc fte ftf fto ftt ftu fua fub fue fuf fuo fut fuu oaa oab oac oae oaf oao oat oau ob- oba obb obc obe obf obo obt obu oc- oca ocb occ ocf oco oct ocu oea oeb oec oee oef oeo oet of- ofa ofb ofc ofe off ofo oft ofu oo- ooa oob ooc oof ooo oot ot- ota otb otc ote otf oto ott otu ou- oua ouc oue ouf ouo out taa tab tac tae taf tao tat tau tba tbb tbc tbe tbf tbo tbt tbu tca tcb tcc tce tcf tco tct tcu te- tea teb tec tee tef teo tet teu tfa tfb tfc tfe tff tfo tft tfu to- toa tob toc toe tof too tot tou tta ttb ttc tte ttf tto ttt ttu tua tub tuc tue tuf tuo tut tuu ua- uaa uab uac uae uaf uao uat uau uba ubb ubc ube ubf ubo ubt ubu uca ucb ucc uce ucf uco uct ucu uea ueb uec uee uef uet ufa ufc ufe uff ufo uft ufu uoa uob uoc uoe uoo uot uta utb utc ute utf uto utt utu uua uuc uue uut uuu