a-a a-b a-z aaa aab aag aau aaz ab- aba abb abg abu abz ag- aga agb agg agu agz au- aua aub aug auz az- aza azb azg azu azz b-u baa bab bag bau baz bba bbb bbg bbu bga bgb bgg bgu bgz bua bub bug buu buz bza bzu bzz gaa gab gag gau gaz gba gbg gbu gbz gga ggb ggg ggu ggz gu- gua gub gug guu guz gza gzu ua- uaa uab uag uau uaz uba ubb ubg ubu uga ugb ugg ugu uua uug uuu uza uzb uzu z-g zaa zab zag zaz zbb zgb zgg zub zug zuz zzz