-al a-a a-b a-i aaa aab aae aaf aai aal aax ab- aba abb abe abf abi abl abx aea aeb aee aef aei ael aex af- afa afb afe aff afi afl afx ai- aia aib aie aif aii ail aix al- ala alb ale alf ali all alx ax- axa axe axi axl axx baa bab bae baf bai bal bax bba bbb bbe bbf bbi bbl bbx be- bea beb bee bef bei bel bex bfa bfb bfe bff bfi bfl bfx bi- bia bib bie bif bii bil bix bla blb ble blf bli bll blx bxb bxi bxl bxx eaa eab eae eaf eai eal eax eba ebb ebe ebf ebi ebl ebx eea eeb eee eef eel eex ef- efa efb efe eff efi efl efx eia eib eie eif eii eil eix ela elb ele elf eli ell elx ex- exa exe exi exl exx faa fab fae faf fai fal fax fba fbb fbe fbf fbi fbl fbx fea feb fee fef fei fel fex ffa ffe fff ffi ffl ffx fia fib fie fif fii fil fix fla flb fle flf fli fll flx fxe fxi fxx i-f ia- iaa iab iae iaf iai ial iba ibb ibe ibf ibi ibl ibx ie- iea iee ief iei iel iex ifa ifb ife iff ifi ifl ifx iia iib iie iif iii iil iix il- ila ilb ile ilf ili ill ilx ixe ixi ixl la- laa lab lae laf lai lal lax lba lbb lbe lbf lbi lbl lbx lea leb lee lef lei lel lex lfa lfb lfe lff lfi lfl lfx lia lib lie lif lii lil lix lla llb lle llf lli lll lxi lxx xaa xaf xal xbe xbl xbx xee xel xex xfa xfe xfl xfx xia xie xii xix xla xlb xlf xli xxi xxl xxx