a-a a-c a-t aaa aac aam aao aat aax ac- aca acc acm aco act acx ama amc amm amo amt amx aoa aoc aom aoo aot aox at- ata atc atm ato att atx ax- axa axm axo axt axx c-- caa cac cam cao cat cax cca ccc ccm cco cct ccx cma cmc cmm cmo cmt cmx co- coa coc com coo cot cox cta ctc ctm cto ctt ctx cxc cxo cxt cxx m-o maa mac mam mao mat max mc- mca mcc mcm mco mct mcx mma mmc mmm mmo mmt mmx moa moc mom moo mot mox mta mtc mtm mto mtt mtx mxa mxc oaa oac oam oao oat oax oc- oca occ ocm oco oct ocx om- oma omc omm omo omt omx oo- ooa ooc oom ooo oot oox ot- ota otc otm oto ott ox- oxa oxc oxo oxt oxx t-x taa tac tam tao tat tax tca tcc tcm tco tct tcx tma tmc tmm tmo tmt tmx to- toa toc tom too tot tox tta ttc ttm tto ttt ttx txt xaa xac xam xat xcx xma xmc xmm xmo xmt xmx xoa xoc xom xoo xot xox xtc xtm xtx xxo xxx