a-a a-c a-t aaa aac aae aao aap aat aax ac- aca acc ace aco acp act acx aea aec aee aeo aep aet aex aoa aoc aoe aoo aop aot aox ap- apa apc ape apo app apt apx at- ata atc ate ato atp att atx ax- axa axe axo axp axt axx c-- caa cac cae cao cap cat cax cca ccc cce cco ccp cct ccx ce- cea cec cee ceo cep cet cex co- coa coc coe coo cop cot cox cpa cpc cpe cpo cpp cpt cpx cta ctc cte cto ctp ctt ctx cxc cxo cxp cxt cxx eaa eac eae eao eap eat eax ec- eca ecc ece eco ect ecx eea eec eee eeo eep eet eex eo- eoa eoc eoe eoo eop eot ep- epa epc epe epo epp ept epx eta etc ete eto etp ett etx ex- exa exc exe exo exp ext exx oaa oac oae oao oap oat oax oc- oca occ oco ocp oct ocx oea oec oee oeo oep oet oex oo- ooa ooc ooo oop oot oox op- opa opc ope opo opp opt opx ot- ota otc ote oto otp ott ox- oxa oxc oxo oxt oxx p-p paa pac pae pao pap pat pax pca pcc pce pco pcp pct pcx pea pec pee peo pep pet pex poa poc poe poo pop pot pox ppa ppc ppe ppo ppp ppt ppx pt- pta ptc pte pto ptp ptt ptx pxc pxe pxt t-x taa tac tae tao tap tat tax tca tcc tce tco tcp tct tcx te- tea tec tee teo tep tet tex to- toa toc toe too top tot tox tpa tpc tpe tpo tpp tpt tpx tta ttc tte tto ttp ttt ttx txe txt xaa xac xap xat xcp xcx xee xep xet xex xoa xoc xoo xop xot xox xpa xpc xpe xpo xpp xpt xtc xtp xtx xxo xxp xxx