a-a a-b a-c aaa aab aac aah aar aau ab- aba abb abc abh abr abu ac- aca acb acc ach acr acu aha ahb ahc ahh ahr ahu ar- ara arb arc arh arr aru au- aua aub auc auh aur b-u baa bab bac bah bar bau bba bbb bbc bbh bbr bbu bca bcb bcc bch bcr bcu bha bhb bhc bhh bhr bhu bra brb brh brr bru bua bub buc buh bur buu c-- caa cab cac cah car cau cba cbb cbc cbh cbr cbu cca ccb ccc cch ccr ccu ch- cha chb chc chh chr chu cra crb crc crh crr cru cua cub cuc cuh cur cuu haa hab hac hah har hau hba hbb hbc hbh hbr hbu hca hcb hcc hch hcr hha hhb hhc hhh hhr hhu hr- hra hrb hrc hrh hrr hru hua hub huc huh hur huu ra- raa rab rac rah rar rau rba rbb rbc rbh rbr rbu rca rcb rcc rch rcr rcu rh- rha rhb rhc rhh rhr rhu rra rrb rrc rrh rrr rru rua rub ruc ruh rur ruu ua- uaa uab uac uah uar uau uba ubb ubc ubh ubr ubu uca ucb ucc uch ucr ucu uha uhb uhc uhh uhr uhu ur- ura urb urc urr uru uua uuc uur uuu