a-a a-b a-i aaa aab aae aag aai aau aax ab- aba abb abe abg abi abu abx aea aeb aee aeg aei aeu aex ag- aga agb age agg agi agu agx ai- aia aib aie aig aii aiu aix au- aua aub aue aug aui aux ax- axa axe axi axx b-u baa bab bae bag bai bau bax bba bbb bbe bbg bbi bbu bbx be- bea beb bee beg bei beu bex bga bgb bge bgg bgi bgu bgx bi- bia bib bie big bii biu bix bua bub bue bug bui buu bux bxb bxi bxx eaa eab eae eag eai eau eax eba ebb ebe ebg ebi ebu ebx eea eeb eee eeg eex ega egb ege egg egi egu egx eia eib eie eig eii eiu eix eu- eua eub eue eug eui eux ex- exa exe exi exu exx gaa gab gae gag gai gau gba gbe gbg gbi gbu gbx ge- gea geb gee geg gei geu gex gga ggb ggg ggi ggu gia gib gie gig gii giu gu- gua gub gue gug gui guu gxa ia- iaa iab iae iag iai iau iba ibb ibe ibg ibi ibu ibx ie- iea iee ieg iei iex iga igb ige igg igi igu iia iib iie iii iiu iix iu- iua iub iue iug iui ixe ixi ua- uaa uab uae uag uai uau uba ubb ube ubg ubi ubu ubx uea ueb uee ueg uei uga ugb uge ugg ugi ugu ugx uia uib uie uig uii uiu uua uue uug uuu uxb uxu xaa xag xau xbe xbx xee xeg xeu xex xge xgi xia xie xii xiu xix xue xui xxi xxx