-th a-a a-b a-c a-t aaa aab aac aah aao aat aay ab- aba abb abc abh abo abt aby ac- aca acb acc ach aco act acy aha ahb ahc ahh aho aht ahy aoa aob aoc aoh aoo aot at- ata atb atc ath ato att ay- aya ayc ayh ayo ayt baa bab bac bah bao bat bay bba bbb bbc bbh bbo bbt bby bca bcb bcc bch bco bct bcy bha bhb bhc bhh bho bht boa bob boc boh boo bot boy bta btb btc bth bto btt bty by- bya byc byh byo byt c-- caa cab cac cah cao cat cay cba cbb cbc cbh cbo cbt cby cca ccb ccc cch cco cct ch- cha chb chc chh cho cht chy co- coa cob coc coh coo cot coy cta ctb ctc cth cto ctt cty cya cyb cyc cyo cyt haa hab hac hah hao hat hay hba hbb hbc hbh hbo hbt hby hca hcb hcc hch hco hct hcy hha hhb hhc hhh hho hht hhy hoa hob hoc hoh hoo hot hoy hta htb htc hth hto htt hty hy- hya hyb hyc hyh hyo hyt hyy oaa oab oac oah oao oat ob- oba obb obc obh obo obt oby oc- oca ocb occ och oco oct oha ohc ohh oho oht oo- ooa oob ooc ooh ooo oot ot- ota otb otc oth oto ott oya oyo taa tab tac tah tao tat tay tba tbb tbc tbh tbo tbt tca tcb tcc tch tco tct th- tha thb thc thh tho tht thy to- toa tob toc toh too tot toy tta ttb ttc tth tto ttt tty tya tyc tyo tyt yaa yab yac yah yao yat yay ybc yby yca ycc ych yco ycy yha yhc yht yob yoc yoo yot yoy yta ytc yth yto ytt yyb yyc yyt yyy