a-a a-b a-c aaa aab aac aag aah aar aau ab- aba abb abc abg abh abr abu ac- aca acb acc acg ach acr acu ag- aga agb agc agg agh agr agu aha ahb ahc ahg ahh ahr ahu ar- ara arb arc arg arh arr aru au- aua aub auc aug auh aur b-u baa bab bac bag bah bar bau bba bbb bbc bbg bbh bbr bbu bca bcb bcc bcg bch bcr bcu bga bgb bgc bgg bgh bgr bgu bha bhb bhc bhg bhh bhr bhu bra brb brg brh brr bru bua bub buc bug buh bur buu c-- caa cab cac cag cah car cau cba cbb cbc cbg cbh cbr cbu cca ccb ccc ccg cch ccr ccu cga cgb cgc cgg cgh cgr cgu ch- cha chb chc chg chh chr chu cra crb crc crg crh crr cru cua cub cuc cug cuh cur cuu gaa gab gac gag gah gar gau gba gbc gbg gbh gbr gbu gca gcb gcc gcg gch gcr gcu gga ggb ggc ggg ggh ggr ggu gha ghb ghc ghg ghh ghr gra grb grc grg grh grr gru gu- gua gub guc gug gur guu haa hab hac hag hah har hau hba hbb hbc hbg hbh hbr hbu hca hcb hcc hcg hch hcr hga hgb hgc hgg hgh hgr hgu hha hhb hhc hhg hhh hhr hhu hr- hra hrb hrc hrg hrh hrr hru hua hub huc hug huh hur huu ra- raa rab rac rag rah rar rau rba rbb rbc rbg rbh rbr rbu rca rcb rcc rcg rch rcr rcu rga rgb rgc rgg rgh rgr rh- rha rhb rhc rhg rhh rhr rhu rra rrb rrc rrg rrh rrr rru rua rub ruc rug ruh rur ruu ua- uaa uab uac uag uah uar uau uba ubb ubc ubg ubh ubr ubu uca ucb ucc ucg uch ucr ucu uga ugb ugc ugg ugh ugr ugu uha uhb uhc uhh uhr uhu ur- ura urb urc urg urr uru uua uuc uug uur uuu