-th a-a a-b a-i a-t aaa aab aae aah aai aat aax ab- aba abb abe abh abi abt abx aea aeb aee aeh aei aet aex aha ahb ahe ahh ahi aht ahx ai- aia aib aie aih aii ait aix at- ata atb ate ath ati att atx ax- axa axe axh axi axt axx baa bab bae bah bai bat bax bba bbb bbe bbh bbi bbt bbx be- bea beb bee beh bei bet bex bha bhb bhe bhh bhi bht bhx bi- bia bib bie bih bii bit bix bta btb bte bth bti btt btx bxb bxi bxx eaa eab eae eah eai eat eax eba ebb ebe ebh ebi ebt ebx eea eeb eee eet eex eha ehb ehe ehh ehi eht eia eib eie eii eit eix eta etb ete eth eti ett etx ex- exa exe exh exi ext exx h-i haa hab hae hah hai hat hax hba hbb hbe hbh hbi hbt hbx he- hea heb hee heh hei het hex hha hhb hhe hhh hhi hht hia hib hie hih hii hit hix hta htb hte hth hti htt htx ia- iaa iab iae iah iai iat iba ibb ibe ibh ibi ibt ibx ie- iea iee iei iet iex iha ihb ihe ihh ihi iht iia iib iie iih iii iit iix ita itb ite ith iti itt itx ixe ixi t-x taa tab tae tah tai tat tax tba tbb tbe tbh tbi tbt te- tea teb tee teh tei tet tex th- tha thb the thh thi tht thx tia tib tie tih tii tit tix tta ttb tte tth tti ttt ttx txe txi txt xaa xat xbe xbx xee xet xex xht xia xie xii xit xix xti xtx xxi xxx