-al -er a-a a-b a-i aaa aab aae aai aal aar aax ab- aba abb abe abi abl abr abx aea aeb aee aei ael aer aex ai- aia aib aie aii ail air aix al- ala alb ale ali all alr alx ar- ara arb are ari arl arr arx ax- axa axe axi axl axr axx baa bab bae bai bal bar bax bba bbb bbe bbi bbl bbr bbx be- bea beb bee bei bel ber bex bi- bia bib bie bii bil bir bix bla blb ble bli bll blr blx bra brb bre bri brl brr brx bxb bxi bxl bxx eaa eab eae eai eal ear eax eba ebb ebe ebi ebl ebr ebx eea eeb eee eel eer eex eia eib eie eii eil eir eix ela elb ele eli ell elr elx era erb ere eri erl err ex- exa exe exi exl exr exx ia- iaa iab iae iai ial iar iba ibb ibe ibi ibl ibr ibx ie- iea iee iei iel ier iex iia iib iie iii iil iir iix il- ila ilb ile ili ill ilr ilx ir- ira irb ire iri irl irr irx ixe ixi ixl la- laa lab lae lai lal lar lax lba lbb lbe lbi lbl lbr lbx lea leb lee lei lel ler lex lia lib lie lii lil lir lix lla llb lle lli lll llr lra lrb lri lrr lxi lxr lxx ra- raa rab rae rai ral rar rax rba rbb rbe rbi rbl rbr rbx re- rea reb ree rei rel rer rex ria rib rie rii ril rir rix rla rle rli rll rlr rra rrb rri rrl rrr rxr xaa xal xar xbe xbl xbr xbx xee xel xer xex xia xie xii xix xla xlb xli xlr xrx xxi xxl xxx