c-- ccc ccd cce ccf cck cco ccs cct cdc cdd cde cdf cdk cdo cds cdt ce- cec ced cee cef cek ceo ces cet cfc cfd cfe cff cfk cfo cfs cft ckc ckd cko cks ckt co- coc cod coe cof cok coo cos cot csc csd cse csf csk cso css cst ctc ctd cte ctf ctk cto cts ctt dcc dcd dce dcf dck dco dcs dct ddc ddd dde ddf ddk ddo dds ddt de- dec ded dee def dek deo des det dfc dfd dfe dff dfk dfo dfs dft dkc dke dkk dko dks dkt doc dod doe dof dok doo dos dot dsc dsd dse dsf dsk dso dss dst dtc dtd dte dtf dtk dto dts dtt ec- ecc ecd ece ecf eck eco ecs ect ed- edc edd ede edf edk edo eds edt eec eed eee eef eek eeo ees eet ef- efc efd efe eff efo efs eft ekc ekd eke ekf eko eks ekt eo- eoc eod eoe eof eok eoo eos eot es- esc esd ese esf esk eso ess est etc etd ete etf etk eto ets ett fcc fcd fce fcf fck fco fcs fct fdc fdd fde fdf fdk fdo fds fdt fec fed fee fef fek feo fes fet ffc ffd ffe fff ffk ffo ffs fft fkc fkf fkk fkt foc foe fof fok foo fos fot fsc fsd fse fsf fsk fso fss fst ftc ftd fte ftf ftk fto fts ftt k-t kcc kcd kce kck kcs kct kdc kde kdf kdk kdo kds kdt ke- kec ked kee kef kek keo kes ket kfc kfd kff kfo kfs kkc kke kkk kks kkt koc kod koe kof kok koo kos kot ksc ksd kse ksf ksk kso kss kst ktc kte ktf ktk kto kts ktt oc- occ ocd ocf ock 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 okc okd oke okk oko oks oo- ooc ood oof ook ooo oos oot os- osc osd ose osf osk oso oss ost ot- otc otd ote otf otk oto ots ott scc scd sce scf sck sco scs sct sdc sdd sde sdf sdk sdo sds sdt se- sec sed see sef sek seo ses set sfc sfd sfe sff sfk sfo sfs sft sk- skc skd ske skf skk sko sks skt soc sod soe sof sok soo sos sot ss- ssc ssd sse ssf ssk sso sss sst stc std ste stf stk sto sts stt tcc tcd tce tcf tck tco tcs tct tdc tdd tde tdf tdk tdo tds tdt te- tec ted tee tef tek teo tes tet tfc tfd tfe tff tfk tfo tfs tft tkc tke tkk tko tks tkt to- toc tod toe tof tok too tos tot tsc tsd tse tsf tsk tso tss tst ttc ttd tte ttf ttk tto tts ttt