a-a a-b a-c aaa aab aac aah aan aar aau ab- aba abb abc abh abn abr abu ac- aca acb acc ach acn acr acu aha ahb ahc ahh ahn ahr ahu an- ana anb anc anh ann anr anu ar- ara arb arc arh arn arr aru au- aua aub auc auh aun aur b-u baa bab bac bah ban bar bau bba bbb bbc bbh bbn bbr bbu bca bcb bcc bch bcn bcr bcu bha bhb bhc bhh bhr bhu bna bnb bnc bnn bnr bnu bra brb brh brn brr bru bua bub buc buh bun bur buu c-- caa cab cac cah can car cau cba cbb cbc cbh cbn cbr cbu cca ccb ccc cch ccn ccr ccu ch- cha chb chc chh chn chr chu cn- cna cnb cnc cnh cnn cnr cnu cra crb crc crh crn crr cru cua cub cuc cuh cun cur cuu haa hab hac hah han har hau hba hbb hbc hbh hbn hbr hbu hca hcb hcc hch hcn hcr hha hhb hhc hhh hhn hhr hhu hna hnb hnc hnh hnn hnu hr- hra hrb hrc hrh hrn hrr hru hua hub huc huh hun hur huu naa nab nac nah nan nar nau nba nbb nbc nbn nbr nbu nca ncb ncc nch ncn ncr ncu nha nhb nhc nhh nhn nhr nhu nna nnb nnc nnh nnn nnu nra nrb nrc nrn nrr nru nua nub nuc nuh nun nur nuu ra- raa rab rac rah ran rar rau rba rbb rbc rbh rbn rbr rbu rca rcb rcc rch rcn rcr rcu rh- rha rhb rhc rhh rhn rhr rhu rna rnb rnc rnh rnn rnr rnu rra rrb rrc rrh rrn rrr rru rua rub ruc ruh run rur ruu ua- uaa uab uac uah uan uar uau uba ubb ubc ubh ubn ubr ubu uca ucb ucc uch ucn ucr ucu uha uhb uhc uhh uhr uhu un- una unb unc unh unn unr unu ur- ura urb urc urn urr uru uua uuc uun uur uuu