a-a a-b aaa aab aag aam aau ab- aba abb abg abm abu ag- aga agb agg agm agu ama amb amg amm amu au- aua aub aug aum b-u baa bab bag bam bau bba bbb bbg bbm bbu bga bgb bgg bgm bgu bma bmb bmg bmm bmu bua bub bug bum buu gaa gab gag gam gau gba gbg gbm gbu gga ggb ggg ggm ggu gma gmb gmg gmm gu- gua gub gug gum guu maa mab mag mam mau mba mbb mbg mbm mbu mga mgb mgm mgu mma mmb mmg mmm mmu mua mub mug mum muu ua- uaa uab uag uam uau uba ubb ubg ubu uga ugb ugg ugm ugu um- uma umb umg umm umu uua uug uum uuu