-al -ol a-a a-c aaa aac aae aal aao aax ac- aca acc ace acl aco acx aea aec aee ael aeo aex al- ala alc ale all alo alx aoa aoc aoe aol aoo aox ax- axa axe axl axo axx c-- caa cac cae cal cao cax cca ccc cce ccl cco ccx ce- cea cec cee cel ceo cex cl- cla clc cle cll clo clx co- coa coc coe col coo cox cxc cxl cxo cxx eaa eac eae eal eao eax ec- eca ecc ece ecl eco ecx eea eec eee eel eeo eex ela elc ele ell elo elx eo- eoa eoc eoe eol eoo ex- exa exc exe exl exo exx la- laa lac lae lal lao lax lca lcc lce lcl lco lcx lea lec lee lel leo lex lla llc lle lll llo loa loc loe lol loo lox lxc lxo lxx oaa oac oae oal oao oax oc- oca occ ocl oco ocx oea oec oee oel oeo oex ola olc ole oll olo oo- ooa ooc ool ooo oox ox- oxa oxc oxo oxx xaa xac xal xcl xcx xee xel xex xla xoa xoc xoo xox xxl xxo xxx