-th a-a a-b a-t aaa aab aad aah aar aat ab- aba abb abd abh abr abt ad- ada adb add adh adr adt aha ahb ahd ahh ahr aht ar- ara arb ard arh arr art at- ata atb atd ath atr att baa bab bad bah bar bat bba bbb bbd bbh bbr bbt bda bdb bdd bdh bdr bdt bha bhb bhd bhh bhr bht bra brb brd brh brr brt bta btb btd bth btr btt daa dab dad dah dar dat dba dbb dbd dbh dbr dbt dda ddb ddd ddh ddr ddt dh- dha dhb dhd dhh dhr dht dra drb drd drr drt dta dtb dtd dth dtr dtt haa hab had hah har hat hba hbb hbd hbh hbr hbt hda hdb hdd hdh hdr hdt hha hhb hhd hhh hhr hht hr- hra hrb hrd hrh hrr hrt hta htb htd hth htr htt ra- raa rab rad rah rar rat rba rbb rbd rbh rbr rbt rda rdb rdd rdh rdr rdt rh- rha rhb rhd rhh rhr rht rra rrb rrd rrh rrr rrt rta rtb rtd rtr rtt taa tab tad tah tar tat tba tbb tbd tbh tbr tbt tda tdb tdd tdh tdr tdt th- tha thb thd thh thr tht tra trb trd trh trr trt tta ttb ttd tth ttr ttt