a-a a-b a-c a-t aaa aab aac aad aan aao aat aau ab- aba abb abc abd abn abo abt abu ac- aca acb acc acd acn aco act acu ad- ada adb adc add adn ado adt adu an- ana anb anc and ann ano ant anu aoa aob aoc aod aon aoo aot aou at- ata atb atc atd atn ato att atu au- aua aub auc aud aun auo aut b-u baa bab bac bad ban bao bat bau bba bbb bbc bbd bbn bbo bbt bbu bca bcb bcc bcd bcn bco bct bcu bda bdb bdc bdd bdo bdt bdu bna bnb bnc bnd bnn bno bnt bnu boa bob boc bod bon boo bot bou bta btb btc btd btn bto btt btu bua bub buc bud bun buo but buu c-- caa cab cac cad can cao cat cau cba cbb cbc cbd cbn cbo cbt cbu cca ccb ccc ccd ccn cco cct ccu cda cdb cdc cdd cdn cdo cdt cdu cn- cna cnb cnc cnd cnn cno cnt cnu co- coa cob coc cod con coo cot cou cta ctb ctc ctd ctn cto ctt ctu cua cub cuc cud cun cuo cut cuu daa dab dac dad dan dao dat dau dba dbb dbc dbd dbn dbo dbt dbu dca dcb dcc dcd dcn dco dct dcu dda ddb ddc ddd ddn ddo ddt ddu dna dnb dnc dnd dnn dno dnt doa dob doc dod don doo dot dou dta dtb dtc dtd dtn dto dtt dtu dua dub duc dud dun duo dut naa nab nac nad nan nao nat nau nba nbb nbc nbd nbn nbo nbt nbu nca ncb ncc ncd ncn nco nct ncu nda ndb ndc ndd ndn ndo ndt ndu nna nnb nnc nnn nno nnt nnu no- noa nob noc nod non noo not nou nta ntb ntc ntd ntn nto ntt ntu nua nub nuc nud nun nuo nut nuu oaa oab oac oad oan oao oat oau ob- oba obb obc obd obn obo obt obu oc- oca ocb occ ocd ocn oco oct ocu oda odb odc odd odn odo odt odu on- ona onb onc ond onn ono ont onu oo- ooa oob ooc ood oon ooo oot ot- ota otb otc otd otn oto ott otu ou- oua ouc oud oun ouo out taa tab tac tad tan tao tat tau tba tbb tbc tbd tbn tbo tbt tbu tca tcb tcc tcd tcn tco tct tcu tda tdb tdc tdd tdn tdo tdt tdu tna tnb tnc tnd tnn tno tnt to- toa tob toc tod ton too tot tou tta ttb ttc ttd ttn tto ttt ttu tua tub tuc tud tun tuo tut tuu ua- uaa uab uac uad uan uao uat uau uba ubb ubc ubn ubo ubt ubu uca ucb ucc ucd ucn uco uct ucu uda udb udc udd udn udo udt udu un- una unb unc und unn uno unt unu uoa uob uoc uod uon uoo uot uta utb utc utd utn uto utt utu uua uuc uun uut uuu