a-a a-b aaa aab aaj aak aan aao ab- aba abb abj abk abn abo aja ajb ajj ajk ajn ajo aka akb akj akk akn ako an- ana anb anj ank ann ano aoa aob aoj aok aon aoo baa bab baj bak ban bao bba bbb bbk bbn bbo bja bjj bjk bjn bka bkb bkk bkn bko bna bnb bnj bnk bnn bno boa bob boj bok bon boo jaa jab jaj jak jan jao jba jbj jbk jbo jja jjb jjj jjk jka jkb jkk jkn jko jna jnj jnn jno joa job joj jok jon joo ka- kaa kab kaj kak kan kao kba kbb kbk kbn kbo kjb kkb kkk kkn kn- kna knk knn kno koa kob kok kon koo naa nab naj nak nan nao nba nbb nbk nbn nbo nja njk njn nka nkj nkk nkn nko nna nnb nnk nnn nno no- noa nob noj nok non noo oaa oab oaj oak oan oao ob- oba obb obj obk obn obo oja ojb ojo oka okb okj okk oko on- ona onb onj onk onn ono oo- ooa oob ook oon ooo