c-- ccc ccd cce ccs cct ccx cdc cdd cde cds cdt cdx ce- cec ced cee ces cet cex csc csd cse css cst csx ctc ctd cte cts ctt ctx cxc cxs cxt cxx dcc dcd dce dcs dct dcx ddc ddd dde dds ddt ddx de- dec ded dee des det dex dsc dsd dse dss dst dsx dtc dtd dte dts dtt dtx dxc dxd dxs dxt dxx ec- ecc ecd ece ecs ect ecx ed- edc edd ede eds edt edx eec eed eee ees eet eex es- esc esd ese ess est esx etc etd ete ets ett etx ex- exc exd exe exs ext exx scc scd sce scs sct scx sdc sdd sde sds sdt se- sec sed see ses set sex ss- ssc ssd sse sss sst ssx stc std ste sts stt stx sxc sxs sxt t-x tcc tcd tce tcs tct tcx tdc tdd tde tds tdt tdx te- tec ted tee tes tet tex tsc tsd tse tss tst tsx ttc ttd tte tts ttt ttx txe txs txt xcd xcx xdc xde xds xdt xed xee xes xet xex xsc xss xst xtc xts xtx xxx