-al a-a a-b a-i aaa aab aae aai aal aax ab- aba abb abe abi abl abx aea aeb aee aei ael aex ai- aia aib aie aii ail aix al- ala alb ale ali all alx ax- axa axe axi axl axx baa bab bae bai bal bax bba bbb bbe bbi bbl bbx be- bea beb bee bei bel bex bi- bia bib bie bii bil bix bla blb ble bli bll blx bxb bxi bxl bxx eaa eab eae eai eal eax eba ebb ebe ebi ebl ebx eea eeb eee eel eex eia eib eie eii eil eix ela elb ele eli ell elx ex- exa exe exi exl exx ia- iaa iab iae iai ial iba ibb ibe ibi ibl ibx ie- iea iee iei iel iex iia iib iie iii iil iix il- ila ilb ile ili ill ilx ixe ixi ixl la- laa lab lae lai lal lax lba lbb lbe lbi lbl lbx lea leb lee lei lel lex lia lib lie lii lil lix lla llb lle lli lll lxi lxx xaa xal xbe xbl xbx xee xel xex xia xie xii xix xla xlb xli xxi xxl xxx