-er -th a-a a-b a-i a-t aaa aab aae aah aai aar aat aax ab- aba abb abe abh abi abr abt abx aea aeb aee aeh aei aer aet aex aha ahb ahe ahh ahi ahr aht ahx ai- aia aib aie aih aii air ait aix ar- ara arb are arh ari arr art arx at- ata atb ate ath ati atr att atx ax- axa axe axh axi axr axt axx baa bab bae bah bai bar bat bax bba bbb bbe bbh bbi bbr bbt bbx be- bea beb bee beh bei ber bet bex bha bhb bhe bhh bhi bhr bht bhx bi- bia bib bie bih bii bir bit bix bra brb bre brh bri brr brt brx bta btb bte bth bti btr btt btx bxb bxi bxx eaa eab eae eah eai ear eat eax eba ebb ebe ebh ebi ebr ebt ebx eea eeb eee eer eet eex eha ehb ehe ehh ehi ehr eht eia eib eie eii eir eit eix era erb ere erh eri err ert eta etb ete eth eti etr ett etx ex- exa exe exh exi exr ext exx h-i haa hab hae hah hai har hat hax hba hbb hbe hbh hbi hbr hbt hbx he- hea heb hee heh hei her het hex hha hhb hhe hhh hhi hhr hht hia hib hie hih hii hir hit hix hr- hra hrb hre hrh hri hrr hrt hta htb hte hth hti htr htt htx ia- iaa iab iae iah iai iar iat iba ibb ibe ibh ibi ibr ibt ibx ie- iea iee iei ier iet iex iha ihb ihe ihh ihi ihr iht iia iib iie iih iii iir iit iix ir- ira irb ire iri irr irt irx ita itb ite ith iti itt itx ixe ixi ra- raa rab rae rah rai rar rat rax rba rbb rbe rbh rbi rbr rbt rbx re- rea reb ree reh rei rer ret rex rh- rha rhb rhe rhh rhi rhr rht ria rib rie rih rii rir rit rix rra rrb rrh rri rrr rrt rta rtb rte rti rtr rtt rtx rxr t-x taa tab tae tah tai tar tat tax tba tbb tbe tbh tbi tbr tbt te- tea teb tee teh tei ter tet tex th- tha thb the thh thi thr tht thx tia tib tie tih tii tir tit tix tra trb tre trh tri trr trt trx tta ttb tte tth tti ttr ttt ttx txe txi txt xaa xar xat xbe xbr xbx xee xer xet xex xht xia xie xii xit xix xrt xrx xti xtr xtx xxi xxx