a-a a-b aaa aab aah aaj aak aao aar ab- aba abb abh abj abk abo abr aha ahb ahh ahj ahk aho ahr aja ajb ajh ajj ajk ajo ajr aka akb akh akj akk ako akr aoa aob aoh aoj aok aoo aor ar- ara arb arh arj ark aro arr baa bab bah baj bak bao bar bba bbb bbh bbk bbo bbr bha bhb bhh bhj bhk bho bhr bja bjj bjk bjr bka bkb bkk bko bkr boa bob boh boj bok boo bor bra brb brh brj brk bro brr haa hab hah haj hak hao har hba hbb hbh hbj hbk hbo hbr hha hhb hhh hhj hhk hho hhr hja hjk hjo hjr hka hkb hkh hkk hko hkr hoa hob hoh hok hoo hor hr- hra hrb hrh hrj hrk hro hrr jaa jab jah jaj jak jao jar jba jbj jbk jbo jbr jha jhj jho jhr jja jjb jjj jjk jjr jka jkb jkh jkk jko jkr joa job joh joj jok joo jor jra jrb jrk jro jrr ka- kaa kab kah kaj kak kao kar kba kbb kbh kbk kbo kbr kha khh khj khk kho khr kjb kjr kkb kkh kkk kkr koa kob koh kok koo kor kra krk kro krr oaa oab oah oaj oak oao oar ob- oba obb obh obj obk obo obr oha ohh oho ohr oja ojb ojo oka okb okj okk oko okr oo- ooa oob ooh ook ooo oor or- ora orb orh ork oro orr ra- raa rab rah raj rak rao rar rba rbb rbh rbk rbo rbr rh- rha rhb rhh rho rhr rja rjk rjr rkb rkk rko roa rob roh roj rok roo ror rra rrb rrh rrk rrr