c-- ccc ccd cce ccf cco ccs cct cdc cdd cde cdf cdo cds cdt ce- cec ced cee cef ceo ces cet cfc cfd cfe cff cfo cfs cft co- coc cod coe cof coo cos cot csc csd cse csf cso css cst ctc ctd cte ctf cto cts ctt dcc dcd dce dcf dco dcs dct ddc ddd dde ddf ddo dds ddt de- dec ded dee def deo des det dfc dfd dfe dff dfo dfs dft doc dod doe dof doo dos dot dsc dsd dse dsf dso dss dst dtc dtd dte dtf dto dts dtt ec- ecc ecd ece ecf eco ecs ect ed- edc edd ede edf edo eds edt eec eed eee eef eeo ees eet ef- efc efd efe eff efo efs eft eo- eoc eod eoe eof eoo eos eot es- esc esd ese esf eso ess est etc etd ete etf eto ets ett fcc fcd fce fcf fco fcs fct fdc fdd fde fdf fdo fds fdt fec fed fee fef feo fes fet ffc ffd ffe fff ffo ffs fft foc foe fof foo fos fot fsc fsd fse fsf fso fss fst ftc ftd fte ftf fto fts ftt oc- occ ocd ocf oco ocs oct odc odd ode odf odo ods odt oec oed oee oef oeo oes oet of- ofc ofd ofe off ofo ofs oft oo- ooc ood oof ooo oos oot os- osc osd ose osf oso oss ost ot- otc otd ote otf oto ots ott scc scd sce scf sco scs sct sdc sdd sde sdf sdo sds sdt se- sec sed see sef seo ses set sfc sfd sfe sff sfo sfs sft soc sod soe sof soo sos sot ss- ssc ssd sse ssf sso sss sst stc std ste stf sto sts stt tcc tcd tce tcf tco tcs tct tdc tdd tde tdf tdo tds tdt te- tec ted tee tef teo tes tet tfc tfd tfe tff tfo tfs tft to- toc tod toe tof too tos tot tsc tsd tse tsf tso tss tst ttc ttd tte ttf tto tts ttt