a-a a-b a-c aaa aab aac aag aah aau ab- aba abb abc abg abh abu ac- aca acb acc acg ach acu ag- aga agb agc agg agh agu aha ahb ahc ahg ahh ahu au- aua aub auc aug auh b-u baa bab bac bag bah bau bba bbb bbc bbg bbh bbu bca bcb bcc bcg bch bcu bga bgb bgc bgg bgh bgu bha bhb bhc bhg bhh bhu bua bub buc bug buh buu c-- caa cab cac cag cah cau cba cbb cbc cbg cbh cbu cca ccb ccc ccg cch ccu cga cgb cgc cgg cgh cgu ch- cha chb chc chg chh chu cua cub cuc cug cuh cuu gaa gab gac gag gah gau gba gbc gbg gbh gbu gca gcb gcc gcg gch gcu gga ggb ggc ggg ggh ggu gha ghb ghc ghg ghh gu- gua gub guc gug guu haa hab hac hag hah hau hba hbb hbc hbg hbh hbu hca hcb hcc hcg hch hga hgb hgc hgg hgh hgu hha hhb hhc hhg hhh hhu hua hub huc hug huh huu ua- uaa uab uac uag uah uau uba ubb ubc ubg ubh ubu uca ucb ucc ucg uch ucu uga ugb ugc ugg ugh ugu uha uhb uhc uhh uhu uua uuc uug uuu