a-a a-b aaa aab aad aaf aah aak aar ab- aba abb abd abf abh abk abr ad- ada adb add adf adh adk adr af- afa afb afd aff afh afk afr aha ahb ahd ahf ahh ahk ahr aka akb akd akh akk akr ar- ara arb ard arf arh ark arr baa bab bad baf bah bak bar bba bbb bbd bbf bbh bbk bbr bda bdb bdd bdf bdh bdk bdr bfa bfb bfd bff bfh bfr bha bhb bhd bhf bhh bhk bhr bka bkb bkf bkk bkr bra brb brd brf brh brk brr daa dab dad daf dah dak dar dba dbb dbd dbf dbh dbk dbr dda ddb ddd ddf ddh ddk ddr dfa dfb dfd dff dfh dfk dfr dh- dha dhb dhd dhf dhh dhk dhr dka dkb dkk dkr dra drb drd drk drr faa fab fad faf fah fak far fba fbb fbd fbf fbh fbk fbr fda fdb fdd fdf fdh fdk fdr ffa ffd fff ffh ffk ffr fha fhb fhf fhh fhr fka fkb fkf fkk fra frb frd frf frh frk frr haa hab had haf hah hak har hba hbb hbd hbf hbh hbk hbr hda hdb hdd hdf hdh hdk hdr hfa hfb hfd hff hfh hfk hfr hha hhb hhd hhf hhh hhk hhr hka hkb hkd hkf hkh hkk hkr hr- hra hrb hrd hrf hrh hrk hrr ka- kaa kab kad kaf kah kak kar kba kbb kbd kbf kbh kbk kbr kda kdb kdf kdh kdk kdr kfa kfd kff kfh kha khf khh khk khr kkb kkh kkk kkr kra krd krf krk krr ra- raa rab rad raf rah rak rar rba rbb rbd rbf rbh rbk rbr rda rdb rdd rdf rdh rdr rfa rfb rfd rff rfh rfk rfr rh- rha rhb rhd rhf rhh rhr rkb rkf rkk rra rrb rrd rrf rrh rrk rrr