-al a-a a-c a-t aaa aac aae aal aat aax ac- aca acc ace acl act acx aea aec aee ael aet aex al- ala alc ale all alt alx at- ata atc ate atl att atx ax- axa axe axl axt axx c-- caa cac cae cal cat cax cca ccc cce ccl cct ccx ce- cea cec cee cel cet cex cl- cla clc cle cll clt clx cta ctc cte ctl ctt ctx cxc cxl cxt cxx eaa eac eae eal eat eax ec- eca ecc ece ecl ect ecx eea eec eee eel eet eex ela elc ele ell elt elx eta etc ete etl ett etx ex- exa exc exe exl ext exx la- laa lac lae lal lat lax lca lcc lce lcl lct lcx lea lec lee lel let lex lla llc lle lll llt lta ltc lte ltl ltt ltx lxc lxx t-x taa tac tae tal tat tax tca tcc tce tcl tct tcx te- tea tec tee tel tet tex tla tlc tle tll tlt tlx tta ttc tte ttl ttt ttx txe txl txt xaa xac xal xat xcl xcx xee xel xet xex xla xlt xtc xtx xxl xxx