a-a a-b aaa aab aad aah aar ab- aba abb abd abh abr ad- ada adb add adh adr aha ahb ahd ahh ahr ar- ara arb ard arh arr baa bab bad bah bar bba bbb bbd bbh bbr bda bdb bdd bdh bdr bha bhb bhd bhh bhr bra brb brd brh brr daa dab dad dah dar dba dbb dbd dbh dbr dda ddb ddd ddh ddr dh- dha dhb dhd dhh dhr dra drb drd drr haa hab had hah har hba hbb hbd hbh hbr hda hdb hdd hdh hdr hha hhb hhd hhh hhr hr- hra hrb hrd hrh hrr ra- raa rab rad rah rar rba rbb rbd rbh rbr rda rdb rdd rdh rdr rh- rha rhb rhd rhh rhr rra rrb rrd rrh rrr