a-a a-b a-c aaa aab aac aah aak aan aau ab- aba abb abc abh abk abn abu ac- aca acb acc ach ack acn acu aha ahb ahc ahh ahk ahn ahu aka akb akc akh akk akn aku an- ana anb anc anh ank ann anu au- aua aub auc auh auk aun b-u baa bab bac bah bak ban bau bba bbb bbc bbh bbk bbn bbu bca bcb bcc bch bck bcn bcu bha bhb bhc bhh bhk bhu bka bkb bkc bkk bkn bna bnb bnc bnk bnn bnu bua bub buc buh buk bun buu c-- caa cab cac cah cak can cau cba cbb cbc cbh cbk cbn cbu cca ccb ccc cch cck ccn ccu ch- cha chb chc chh chk chn chu cka ckb ckc ckh cn- cna cnb cnc cnh cnn cnu cua cub cuc cuh cuk cun cuu haa hab hac hah hak han hau hba hbb hbc hbh hbk hbn hbu hca hcb hcc hch hck hcn hha hhb hhc hhh hhk hhn hhu hka hkb hkh hkk hkn hku hna hnb hnc hnh hnk hnn hnu hua hub huc huh huk hun huu ka- kaa kab kac kah kak kan kau kba kbb kbc kbh kbk kbn kbu kca kcb kcc kch kck kcn kcu kha khh khk khn khu kkb kkc kkh kkk kkn kku kn- kna knc knk knn knu kub kuc kuh kuk kun kuu naa nab nac nah nak nan nau nba nbb nbc nbk nbn nbu nca ncb ncc nch nck ncn ncu nha nhb nhc nhh nhk nhn nhu nka nkc nkk nkn nku nna nnb nnc nnh nnk nnn nnu nua nub nuc nuh nuk nun nuu ua- uaa uab uac uah uak uan uau uba ubb ubc ubh ubk ubn ubu uca ucb ucc uch uck ucn ucu uha uhb uhc uhh uhu uka ukb ukc ukk ukn uku un- una unb unc unh unk unn unu uua uuc uun uuu