-al -ol a-a a-c a-t aaa aac aal aao aat aax ac- aca acc acl aco act acx al- ala alc all alo alt alx aoa aoc aol aoo aot aox at- ata atc atl ato att atx ax- axa axl axo axt axx c-- caa cac cal cao cat cax cca ccc ccl cco cct ccx cl- cla clc cll clo clt clx co- coa coc col coo cot cox cta ctc ctl cto ctt ctx cxc cxl cxo cxt cxx la- laa lac lal lao lat lax lca lcc lcl lco lct lcx lla llc lll llo llt loa loc lol loo lot lox lta ltc ltl lto ltt ltx lxc lxo lxx oaa oac oal oao oat oax oc- oca occ ocl oco oct ocx ola olc oll olo olt oo- ooa ooc ool ooo oot oox ot- ota otc otl oto ott ox- oxa oxc oxo oxt oxx t-x taa tac tal tao tat tax tca tcc tcl tco tct tcx tla tlc tll tlo tlt tlx to- toa toc tol too tot tox tta ttc ttl tto ttt ttx txl txt xaa xac xal xat xcl xcx xla xlt xoa xoc xoo xot xox xtc xtx xxl xxo xxx