-er -th a-a a-b a-t aaa aab aae aag aah aar aat ab- aba abb abe abg abh abr abt aea aeb aee aeg aeh aer aet ag- aga agb age agg agh agr agt aha ahb ahe ahg ahh ahr aht ar- ara arb are arg arh arr art at- ata atb ate atg ath atr att baa bab bae bag bah bar bat bba bbb bbe bbg bbh bbr bbt be- bea beb bee beg beh ber bet bga bgb bge bgg bgh bgr bgt bha bhb bhe bhg bhh bhr bht bra brb bre brg brh brr brt bta btb bte btg bth btr btt eaa eab eae eag eah ear eat eba ebb ebe ebg ebh ebr ebt eea eeb eee eeg eer eet ega egb ege egg egh egr egt eha ehb ehe ehg ehh ehr eht era erb ere erg erh err ert eta etb ete etg eth etr ett gaa gab gae gag gah gar gat gba gbe gbg gbh gbr gbt ge- gea geb gee geg geh ger get gga ggb ggg ggh ggr ggt gha ghb ghe ghg ghh ghr ght gra grb gre grg grh grr grt gta gtb gte gtg gth gtr gtt haa hab hae hag hah har hat hba hbb hbe hbg hbh hbr hbt he- hea heb hee heg heh her het hga hgb hge hgg hgh hgr hgt hha hhb hhe hhg hhh hhr hht hr- hra hrb hre hrg hrh hrr hrt hta htb hte htg hth htr htt ra- raa rab rae rag rah rar rat rba rbb rbe rbg rbh rbr rbt re- rea reb ree reg reh rer ret rga rgb rge rgg rgh rgr rgt rh- rha rhb rhe rhg rhh rhr rht rra rrb rrg rrh rrr rrt rta rtb rte rtg rtr rtt taa tab tae tag tah tar tat tba tbb tbe tbg tbh tbr tbt te- tea teb tee teg teh ter tet tga tgb tge tgg tgh tgr tgt th- tha thb the thg thh thr tht tra trb tre trg trh trr trt tta ttb tte ttg tth ttr ttt