a-a a-b aaa aab aad aak aan aao aau ab- aba abb abd abk abn abo abu ad- ada adb add adk adn ado adu aka akb akd akk akn ako aku an- ana anb and ank ann ano anu aoa aob aod aok aon aoo aou au- aua aub aud auk aun auo b-u baa bab bad bak ban bao bau bba bbb bbd bbk bbn bbo bbu bda bdb bdd bdk bdo bdu bka bkb bkk bkn bko bna bnb bnd bnk bnn bno bnu boa bob bod bok bon boo bou bua bub bud buk bun buo buu daa dab dad dak dan dao dau dba dbb dbd dbk dbn dbo dbu dda ddb ddd ddk ddn ddo ddu dka dkb dkk dko dku dna dnb dnd dnk dnn dno doa dob dod dok don doo dou dua dub dud duk dun duo ka- kaa kab kad kak kan kao kau kba kbb kbd kbk kbn kbo kbu kda kdb kdk kdo kdu kkb kkk kkn kku kn- kna knd knk knn kno knu koa kob kod kok kon koo kou kub kud kuk kun kuu naa nab nad nak nan nao nau nba nbb nbd nbk nbn nbo nbu nda ndb ndd ndk ndn ndo ndu nka nkk nkn nko nku nna nnb nnk nnn nno nnu no- noa nob nod nok non noo nou nua nub nud nuk nun nuo nuu oaa oab oad oak oan oao oau ob- oba obb obd obk obn obo obu oda odb odd odn odo odu oka okb okd okk oko oku on- ona onb ond onk onn ono onu oo- ooa oob ood ook oon ooo ou- oua oud ouk oun ouo ua- uaa uab uad uak uan uao uau uba ubb ubk ubn ubo ubu uda udb udd udk udn udo udu uka ukb ukk ukn uku un- una unb und unk unn uno unu uoa uob uod uok uon uoo uua uun uuu