-th a-a a-b a-c a-t aaa aab aac aah aao aat aax ab- aba abb abc abh abo abt abx ac- aca acb acc ach aco act acx aha ahb ahc ahh aho aht ahx aoa aob aoc aoh aoo aot aox at- ata atb atc ath ato att atx ax- axa axh axo axt axx baa bab bac bah bao bat bax bba bbb bbc bbh bbo bbt bbx bca bcb bcc bch bco bct bcx bha bhb bhc bhh bho bht bhx boa bob boc boh boo bot box bta btb btc bth bto btt btx bxb bxo bxx c-- caa cab cac cah cao cat cax cba cbb cbc cbh cbo cbt cbx cca ccb ccc cch cco cct ccx ch- cha chb chc chh cho cht chx co- coa cob coc coh coo cot cox cta ctb ctc cth cto ctt ctx cxc cxh cxo cxt cxx haa hab hac hah hao hat hax hba hbb hbc hbh hbo hbt hbx hca hcb hcc hch hco hct hha hhb hhc hhh hho hht hoa hob hoc hoh hoo hot hox hta htb htc hth hto htt htx hxc oaa oab oac oah oao oat oax ob- oba obb obc obh obo obt obx oc- oca ocb occ och oco oct ocx oha ohc ohh oho oht oo- ooa oob ooc ooh ooo oot oox ot- ota otb otc oth oto ott ox- oxa oxb oxc oxo oxt oxx t-x taa tab tac tah tao tat tax tba tbb tbc tbh tbo tbt tca tcb tcc tch tco tct tcx th- tha thb thc thh tho tht thx to- toa tob toc toh too tot tox tta ttb ttc tth tto ttt ttx txt xaa xac xat xbc xbx xcb xch xcx xht xoa xoc xoo xot xox xtc xtx xxo xxx