a-a a-b a-c aaa aab aac aah aak aau ab- aba abb abc abh abk abu ac- aca acb acc ach ack acu aha ahb ahc ahh ahk ahu aka akb akc akh akk aku au- aua aub auc auh auk b-u baa bab bac bah bak bau bba bbb bbc bbh bbk bbu bca bcb bcc bch bck bcu bha bhb bhc bhh bhk bhu bka bkb bkc bkk bua bub buc buh buk buu c-- caa cab cac cah cak cau cba cbb cbc cbh cbk cbu cca ccb ccc cch cck ccu ch- cha chb chc chh chk chu cka ckb ckc ckh cua cub cuc cuh cuk cuu haa hab hac hah hak hau hba hbb hbc hbh hbk hbu hca hcb hcc hch hck hha hhb hhc hhh hhk hhu hka hkb hkh hkk hku hua hub huc huh huk huu ka- kaa kab kac kah kak kau kba kbb kbc kbh kbk kbu kca kcb kcc kch kck kcu kha khh khk khu kkb kkc kkh kkk kku kub kuc kuh kuk kuu ua- uaa uab uac uah uak uau uba ubb ubc ubh ubk ubu uca ucb ucc uch uck ucu uha uhb uhc uhh uhu uka ukb ukc ukk uku uua uuc uuu