a-a a-b aaa aab aah aaj aak aao ab- aba abb abh abj abk abo aha ahb ahh ahj ahk aho aja ajb ajh ajj ajk ajo aka akb akh akj akk ako aoa aob aoh aoj aok aoo baa bab bah baj bak bao bba bbb bbh bbk bbo bha bhb bhh bhj bhk bho bja bjj bjk bka bkb bkk bko boa bob boh boj bok boo haa hab hah haj hak hao hba hbb hbh hbj hbk hbo hha hhb hhh hhj hhk hho hja hjk hjo hka hkb hkh hkk hko hoa hob hoh hok hoo jaa jab jah jaj jak jao jba jbj jbk jbo jha jhj jho jja jjb jjj jjk jka jkb jkh jkk jko joa job joh joj jok joo ka- kaa kab kah kaj kak kao kba kbb kbh kbk kbo kha khh khj khk kho kjb kkb kkh kkk koa kob koh kok koo oaa oab oah oaj oak oao ob- oba obb obh obj obk obo oha ohh oho oja ojb ojo oka okb okj okk oko oo- ooa oob ooh ook ooo