a-a a-b aaa aab aae aak aan aao aau ab- aba abb abe abk abn abo abu aea aeb aee aek aen aeo aeu aka akb ake akk akn ako aku an- ana anb ane ank ann ano anu aoa aob aoe aok aon aoo aou au- aua aub aue auk aun auo b-u baa bab bae bak ban bao bau bba bbb bbe bbk bbn bbo bbu be- bea beb bee bek ben beo beu bka bkb bke bkk bkn bko bna bnb bne bnk bnn bno bnu boa bob boe bok bon boo bou bua bub bue buk bun buo buu eaa eab eae eak ean eao eau eba ebb ebe ebk ebn ebo ebu eea eeb eee eek een eeo eka ekb eke eko eku en- ena enb ene enk enn eno enu eo- eoa eob eoe eok eon eoo eou eu- eua eub eue eun ka- kaa kab kae kak kan kao kau kba kbb kbe kbk kbn kbo kbu ke- kea keb kee kek ken keo kkb kke kkk kkn kku kn- kna kne knk knn kno knu koa kob koe kok kon koo kou kub kue kuk kun kuu naa nab nae nak nan nao nau nba nbb nbe nbk nbn nbo nbu ne- nea neb nee nek nen neo neu nka nke nkk nkn nko nku nna nnb nne nnk nnn nno nnu no- noa nob noe nok non noo nou nua nub nue nuk nun nuo nuu oaa oab oae oak oan oao oau ob- oba obb obe obk obn obo obu oea oeb oee oen oeo oka okb oke okk oko oku on- ona onb one onk onn ono onu oo- ooa oob ook oon ooo ou- oua oue ouk oun ouo ua- uaa uab uae uak uan uao uau uba ubb ube ubk ubn ubo ubu uea ueb uee uen uka ukb uke ukk ukn uku un- una unb une unk unn uno unu uoa uob uoe uok uon uoo uua uue uun uuu