-er -th a-a a-b a-t aaa aab aae aaf aah aar aat ab- aba abb abe abf abh abr abt aea aeb aee aef aeh aer aet af- afa afb afe aff afh afr aft aha ahb ahe ahf ahh ahr aht ar- ara arb are arf arh arr art at- ata atb ate atf ath atr att baa bab bae baf bah bar bat bba bbb bbe bbf bbh bbr bbt be- bea beb bee bef beh ber bet bfa bfb bfe bff bfh bfr bft bha bhb bhe bhf bhh bhr bht bra brb bre brf brh brr brt bta btb bte btf bth btr btt eaa eab eae eaf eah ear eat eba ebb ebe ebf ebh ebr ebt eea eeb eee eef eer eet ef- efa efb efe eff efh efr eft eha ehb ehe ehf ehh ehr eht era erb ere erf erh err ert eta etb ete etf eth etr ett faa fab fae faf fah far fat fba fbb fbe fbf fbh fbr fbt fea feb fee fef feh fer fet ffa ffe fff ffh ffr fft fha fhb fhe fhf fhh fhr fra frb fre frf frh frr frt fta ftb fte ftf fth ftr ftt haa hab hae haf hah har hat hba hbb hbe hbf hbh hbr hbt he- hea heb hee hef heh her het hfa hfb hfe hff hfh hfr hft hha hhb hhe hhf hhh hhr hht hr- hra hrb hre hrf hrh hrr hrt hta htb hte htf hth htr htt ra- raa rab rae raf rah rar rat rba rbb rbe rbf rbh rbr rbt re- rea reb ree ref reh rer ret rfa rfb rfe rff rfh rfr rft rh- rha rhb rhe rhf rhh rhr rht rra rrb rrf rrh rrr rrt rta rtb rte rtf rtr rtt taa tab tae taf tah tar tat tba tbb tbe tbf tbh tbr tbt te- tea teb tee tef teh ter tet tfa tfb tfe tff tfh tfr tft th- tha thb the thf thh thr tht tra trb tre trf trh trr trt tta ttb tte ttf tth ttr ttt