a-a a-b a-c a-t aaa aab aac aad aan aao aat aay ab- aba abb abc abd abn abo abt aby ac- aca acb acc acd acn aco act acy ad- ada adb adc add adn ado adt ady an- ana anb anc and ann ano ant any aoa aob aoc aod aon aoo aot at- ata atb atc atd atn ato att ay- aya ayc ayd ayn ayo ayt baa bab bac bad ban bao bat bay bba bbb bbc bbd bbn bbo bbt bby bca bcb bcc bcd bcn bco bct bcy bda bdb bdc bdd bdo bdt bdy bna bnb bnc bnd bnn bno bnt boa bob boc bod bon boo bot boy bta btb btc btd btn bto btt bty by- bya byc byd byn byo byt c-- caa cab cac cad can cao cat cay cba cbb cbc cbd cbn cbo cbt cby cca ccb ccc ccd ccn cco cct cda cdb cdc cdd cdn cdo cdt cdy cn- cna cnb cnc cnd cnn cno cnt cny co- coa cob coc cod con coo cot coy cta ctb ctc ctd ctn cto ctt cty cya cyb cyc cyd cyn cyo cyt daa dab dac dad dan dao dat day dba dbb dbc dbd dbn dbo dbt dby dca dcb dcc dcd dcn dco dct dda ddb ddc ddd ddn ddo ddt ddy dna dnb dnc dnd dnn dno dnt dny doa dob doc dod don doo dot doy dta dtb dtc dtd dtn dto dtt dty dy- dya dyb dyc dyd dyn dyo dyy naa nab nac nad nan nao nat nay nba nbb nbc nbd nbn nbo nbt nca ncb ncc ncd ncn nco nct nda ndb ndc ndd ndn ndo ndt ndy nna nnb nnc nnn nno nnt no- noa nob noc nod non noo not noy nta ntb ntc ntd ntn nto ntt nya nyc nyd nyn nyo nyt nyy oaa oab oac oad oan oao oat ob- oba obb obc obd obn obo obt oby oc- oca ocb occ ocd ocn oco oct oda odb odc odd odn odo odt on- ona onb onc ond onn ono ont ony oo- ooa oob ooc ood oon ooo oot ot- ota otb otc otd otn oto ott oya oyd oyo taa tab tac tad tan tao tat tay tba tbb tbc tbd tbn tbo tbt tca tcb tcc tcd tcn tco tct tda tdb tdc tdd tdn tdo tdt tdy tna tnb tnc tnd tnn tno tnt to- toa tob toc tod ton too tot toy tta ttb ttc ttd ttn tto ttt tty tya tyc tyd tyn tyo tyt yaa yab yac yad yan yao yat yay ybc yby yca ycc ycd yco ycy yda ydn ydo ydt ydy yna ynd ynn yny yob yoc yod yon yoo yot yoy yta ytc ytd ytn yto ytt yyb yyc yyt yyy