a-a a-b a-c aaa aab aac aah aak aan aao aau ab- aba abb abc abh abk abn abo abu ac- aca acb acc ach ack acn aco acu aha ahb ahc ahh ahk ahn aho ahu aka akb akc akh akk akn ako aku an- ana anb anc anh ank ann ano anu aoa aob aoc aoh aok aon aoo aou au- aua aub auc auh auk aun auo b-u baa bab bac bah bak ban bao bau bba bbb bbc bbh bbk bbn bbo bbu bca bcb bcc bch bck bcn bco bcu bha bhb bhc bhh bhk bho bhu bka bkb bkc bkk bkn bko bna bnb bnc bnk bnn bno bnu boa bob boc boh bok bon boo bou bua bub buc buh buk bun buo buu c-- caa cab cac cah cak can cao cau cba cbb cbc cbh cbk cbn cbo cbu cca ccb ccc cch cck ccn cco ccu ch- cha chb chc chh chk chn cho chu cka ckb ckc ckh cko cn- cna cnb cnc cnh cnn cno cnu co- coa cob coc coh cok con coo cou cua cub cuc cuh cuk cun cuo cuu haa hab hac hah hak han hao hau hba hbb hbc hbh hbk hbn hbo hbu hca hcb hcc hch hck hcn hco hha hhb hhc hhh hhk hhn hho hhu hka hkb hkh hkk hkn hko hku hna hnb hnc hnh hnk hnn hno hnu hoa hob hoc hoh hok hon hoo hou hua hub huc huh huk hun huo huu ka- kaa kab kac kah kak kan kao kau kba kbb kbc kbh kbk kbn kbo kbu kca kcb kcc kch kck kcn kcu kha khh khk khn kho khu kkb kkc kkh kkk kkn kku kn- kna knc knk knn kno knu koa kob koc koh kok kon koo kou kub kuc kuh kuk kun kuu naa nab nac nah nak nan nao nau nba nbb nbc nbk nbn nbo nbu nca ncb ncc nch nck ncn nco ncu nha nhb nhc nhh nhk nhn nhu nka nkc nkk nkn nko nku nna nnb nnc nnh nnk nnn nno nnu no- noa nob noc noh nok non noo nou nua nub nuc nuh nuk nun nuo nuu oaa oab oac oah oak oan oao oau ob- oba obb obc obh obk obn obo obu oc- oca ocb occ och ock ocn oco ocu oha ohc ohh ohn oho ohu oka okb okc okk oko oku on- ona onb onc onh onk onn ono onu oo- ooa oob ooc ooh ook oon ooo ou- oua ouc ouh ouk oun ouo ua- uaa uab uac uah uak uan uao uau uba ubb ubc ubh ubk ubn ubo ubu uca ucb ucc uch uck ucn uco ucu uha uhb uhc uhh uho uhu uka ukb ukc ukk ukn uku un- una unb unc unh unk unn uno unu uoa uob uoc uok uon uoo uua uuc uun uuu