a-a a-c a-t aaa aac aad aae aap aat aax ac- aca acc acd ace acp act acx ad- ada adc add ade adp adt adx aea aec aed aee aep aet aex ap- apa apc apd ape app apt apx at- ata atc atd ate atp att atx ax- axa axe axp axt axx c-- caa cac cad cae cap cat cax cca ccc ccd cce ccp cct ccx cda cdc cdd cde cdp cdt cdx ce- cea cec ced cee cep cet cex cpa cpc cpd cpe cpp cpt cpx cta ctc ctd cte ctp ctt ctx cxc cxp cxt cxx daa dac dad dae dap dat dax dca dcc dcd dce dcp dct dcx dda ddc ddd dde ddp ddt ddx de- dea dec ded dee dep det dex dpa dpc dpd dpe dpp dpt dta dtc dtd dte dtp dtt dtx dxc dxd dxp dxt dxx eaa eac ead eae eap eat eax ec- eca ecc ecd ece ect ecx ed- eda edc edd ede edp edt edx eea eec eed eee eep eet eex ep- epa epc epd epe epp ept epx eta etc etd ete etp ett etx ex- exa exc exd exe exp ext exx p-p paa pac pad pae pap pat pax pca pcc pcd pce pcp pct pcx pda pdc pdd pde pdp pdt pdx pea pec ped pee pep pet pex ppa ppc ppd ppe ppp ppt ppx pt- pta ptc ptd pte ptp ptt ptx pxc pxe pxt t-x taa tac tad tae tap tat tax tca tcc tcd tce tcp tct tcx tda tdc tdd tde tdp tdt tdx te- tea tec ted tee tep tet tex tpa tpc tpd tpe tpp tpt tpx tta ttc ttd tte ttp ttt ttx txe txt xaa xac xad xap xat xcd xcp xcx xda xdc xde xdt xed xee xep xet xex xpa xpc xpd xpe xpp xpt xtc xtp xtx xxp xxx