a-a a-b aaa aab aad aae aak aan aao aau ab- aba abb abd abe abk abn abo abu ad- ada adb add ade adk adn ado adu aea aeb aed aee aek aen aeo aeu aka akb akd ake akk akn ako aku an- ana anb and ane ank ann ano anu aoa aob aod aoe aok aon aoo aou au- aua aub aud aue auk aun auo b-u baa bab bad bae bak ban bao bau bba bbb bbd bbe bbk bbn bbo bbu bda bdb bdd bde bdk bdo bdu be- bea beb bed bee bek ben beo beu bka bkb bke bkk bkn bko bna bnb bnd bne bnk bnn bno bnu boa bob bod boe bok bon boo bou bua bub bud bue buk bun buo buu daa dab dad dae dak dan dao dau dba dbb dbd dbe dbk dbn dbo dbu dda ddb ddd dde ddk ddn ddo ddu de- dea deb ded dee dek den deo deu dka dkb dke dkk dko dku dna dnb dnd dne dnk dnn dno doa dob dod doe dok don doo dou dua dub dud due duk dun duo eaa eab ead eae eak ean eao eau eba ebb ebd ebe ebk ebn ebo ebu ed- eda edb edd ede edk edn edo edu eea eeb eed eee eek een eeo eka ekb ekd eke eko eku en- ena enb end ene enk enn eno enu eo- eoa eob eod eoe eok eon eoo eou eu- eua eub eud eue eun ka- kaa kab kad kae kak kan kao kau kba kbb kbd kbe kbk kbn kbo kbu kda kdb kde kdk kdo kdu ke- kea keb ked kee kek ken keo kkb kke kkk kkn kku kn- kna knd kne knk knn kno knu koa kob kod koe kok kon koo kou kub kud kue kuk kun kuu naa nab nad nae nak nan nao nau nba nbb nbd nbe nbk nbn nbo nbu nda ndb ndd nde ndk ndn ndo ndu ne- nea neb ned nee nek nen neo neu nka nke nkk nkn nko nku nna nnb nne nnk nnn nno nnu no- noa nob nod noe nok non noo nou nua nub nud nue nuk nun nuo nuu oaa oab oad oae oak oan oao oau ob- oba obb obd obe obk obn obo obu oda odb odd ode odn odo odu oea oeb oed oee oen oeo oka okb okd oke okk oko oku on- ona onb ond one onk onn ono onu oo- ooa oob ood ook oon ooo ou- oua oud oue ouk oun ouo ua- uaa uab uad uae uak uan uao uau uba ubb ube ubk ubn ubo ubu uda udb udd ude udk udn udo udu uea ueb ued uee uen uka ukb uke ukk ukn uku un- una unb und une unk unn uno unu uoa uob uod uoe uok uon uoo uua uue uun uuu