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