-er -th a-a a-b a-t aaa aab aad aae aah aar aat ab- aba abb abd abe abh abr abt ad- ada adb add ade adh adr adt aea aeb aed aee aeh aer aet aha ahb ahd ahe ahh ahr aht ar- ara arb ard are arh arr art at- ata atb atd ate ath atr att baa bab bad bae bah bar bat bba bbb bbd bbe bbh bbr bbt bda bdb bdd bde bdh bdr bdt be- bea beb bed bee beh ber bet bha bhb bhd bhe bhh bhr bht bra brb brd bre brh brr brt bta btb btd bte bth btr btt daa dab dad dae dah dar dat dba dbb dbd dbe dbh dbr dbt dda ddb ddd dde ddh ddr ddt de- dea deb ded dee deh der det dh- dha dhb dhd dhe dhh dhr dht dra drb drd dre drr drt dta dtb dtd dte dth dtr dtt eaa eab ead eae eah ear eat eba ebb ebd ebe ebh ebr ebt ed- eda edb edd ede edh edr edt eea eeb eed eee eer eet eha ehb ehd ehe ehh ehr eht era erb erd ere erh err ert eta etb etd ete eth etr ett haa hab had hae hah har hat hba hbb hbd hbe hbh hbr hbt hda hdb hdd hde hdh hdr hdt he- hea heb hed hee heh her het hha hhb hhd hhe hhh hhr hht hr- hra hrb hrd hre hrh hrr hrt hta htb htd hte hth htr htt ra- raa rab rad rae rah rar rat rba rbb rbd rbe rbh rbr rbt rda rdb rdd rde rdh rdr rdt re- rea reb red ree reh rer ret rh- rha rhb rhd rhe rhh rhr rht rra rrb rrd rrh rrr rrt rta rtb rtd rte rtr rtt taa tab tad tae tah tar tat tba tbb tbd tbe tbh tbr tbt tda tdb tdd tde tdh tdr tdt te- tea teb ted tee teh ter tet th- tha thb thd the thh thr tht tra trb trd tre trh trr trt tta ttb ttd tte tth ttr ttt