a-a a-b a-c aaa aab aac aah aan aau ab- aba abb abc abh abn abu ac- aca acb acc ach acn acu aha ahb ahc ahh ahn ahu an- ana anb anc anh ann anu au- aua aub auc auh aun b-u baa bab bac bah ban bau bba bbb bbc bbh bbn bbu bca bcb bcc bch bcn bcu bha bhb bhc bhh bhu bna bnb bnc bnn bnu bua bub buc buh bun buu c-- caa cab cac cah can cau cba cbb cbc cbh cbn cbu cca ccb ccc cch ccn ccu ch- cha chb chc chh chn chu cn- cna cnb cnc cnh cnn cnu cua cub cuc cuh cun cuu haa hab hac hah han hau hba hbb hbc hbh hbn hbu hca hcb hcc hch hcn hha hhb hhc hhh hhn hhu hna hnb hnc hnh hnn hnu hua hub huc huh hun huu naa nab nac nah nan nau nba nbb nbc nbn nbu nca ncb ncc nch ncn ncu nha nhb nhc nhh nhn nhu nna nnb nnc nnh nnn nnu nua nub nuc nuh nun nuu ua- uaa uab uac uah uan uau uba ubb ubc ubh ubn ubu uca ucb ucc uch ucn ucu uha uhb uhc uhh uhu un- una unb unc unh unn unu uua uuc uun uuu