a-a a-b a-c aaa aab aac aah aak aar aau ab- aba abb abc abh abk abr abu ac- aca acb acc ach ack acr acu aha ahb ahc ahh ahk ahr ahu aka akb akc akh akk akr aku ar- ara arb arc arh ark arr aru au- aua aub auc auh auk aur b-u baa bab bac bah bak bar bau bba bbb bbc bbh bbk bbr bbu bca bcb bcc bch bck bcr bcu bha bhb bhc bhh bhk bhr bhu bka bkb bkc bkk bkr bra brb brh brk brr bru bua bub buc buh buk bur buu c-- caa cab cac cah cak car cau cba cbb cbc cbh cbk cbr cbu cca ccb ccc cch cck ccr ccu ch- cha chb chc chh chk chr chu cka ckb ckc ckh cra crb crc crh crk crr cru cua cub cuc cuh cuk cur cuu haa hab hac hah hak har hau hba hbb hbc hbh hbk hbr hbu hca hcb hcc hch hck hcr hha hhb hhc hhh hhk hhr hhu hka hkb hkh hkk hkr hku hr- hra hrb hrc hrh hrk hrr hru hua hub huc huh huk hur huu ka- kaa kab kac kah kak kar kau kba kbb kbc kbh kbk kbr kbu kca kcb kcc kch kck kcr kcu kha khh khk khr khu kkb kkc kkh kkk kkr kku kra krc krk krr kru kub kuc kuh kuk kur kuu ra- raa rab rac rah rak rar rau rba rbb rbc rbh rbk rbr rbu rca rcb rcc rch rcr rcu rh- rha rhb rhc rhh rhr rhu rkb rkc rkk rku rra rrb rrc rrh rrk rrr rru rua rub ruc ruh ruk rur ruu ua- uaa uab uac uah uak uar uau uba ubb ubc ubh ubk ubr ubu uca ucb ucc uch uck ucr ucu uha uhb uhc uhh uhr uhu uka ukb ukc ukk ukr uku ur- ura urb urc urk urr uru uua uuc uur uuu