-al a-a a-b a-t aaa aab aae aal aat aax ab- aba abb abe abl abt abx aea aeb aee ael aet aex al- ala alb ale all alt alx at- ata atb ate atl att atx ax- axa axe axl axt axx baa bab bae bal bat bax bba bbb bbe bbl bbt bbx be- bea beb bee bel bet bex bla blb ble bll blt blx bta btb bte btl btt btx bxb bxl bxx eaa eab eae eal eat eax eba ebb ebe ebl ebt ebx eea eeb eee eel eet eex ela elb ele ell elt elx eta etb ete etl ett etx ex- exa exe exl ext exx la- laa lab lae lal lat lax lba lbb lbe lbl lbt lbx lea leb lee lel let lex lla llb lle lll llt lta ltb lte ltl ltt ltx lxx t-x taa tab tae tal tat tax tba tbb tbe tbl tbt te- tea teb tee tel tet tex tla tle tll tlt tlx tta ttb tte ttl ttt ttx txe txl txt xaa xal xat xbe xbl xbx xee xel xet xex xla xlb xlt xtx xxl xxx