a-a a-b aaa aab aad aaj aak aao ab- aba abb abd abj abk abo ad- ada adb add adj adk ado aja ajb ajd ajj ajk ajo aka akb akd akj akk ako aoa aob aod aoj aok aoo baa bab bad baj bak bao bba bbb bbd bbk bbo bda bdb bdd bdj bdk bdo bja bjd bjj bjk bka bkb bkk bko boa bob bod boj bok boo daa dab dad daj dak dao dba dbb dbd dbk dbo dda ddb ddd ddk ddo dj- dja djb djd djk djo dka dkb dkk dko doa dob dod doj dok doo j-d jaa jab jad jaj jak jao jba jbj jbk jbo jda jdb jdo jja jjb jjj jjk jka jkb jkk jko joa job jod joj jok joo ka- kaa kab kad kaj kak kao kba kbb kbd kbk kbo kda kdb kdk kdo kjb kkb kkk koa kob kod kok koo oaa oab oad oaj oak oao ob- oba obb obd obj obk obo oda odb odd odo oja ojb ojd ojo oka okb okd okj okk oko oo- ooa oob ood ook ooo