c-- ccc ccd cce cck cco ccs cct cdc cdd cde cdk cdo cds cdt ce- cec ced cee cek ceo ces cet ckc ckd cko cks ckt co- coc cod coe cok coo cos cot csc csd cse csk cso css cst ctc ctd cte ctk cto cts ctt dcc dcd dce dck dco dcs dct ddc ddd dde ddk ddo dds ddt de- dec ded dee dek deo des det dkc dke dkk dko dks dkt doc dod doe dok doo dos dot dsc dsd dse dsk dso dss dst dtc dtd dte dtk dto dts dtt ec- ecc ecd ece eck eco ecs ect ed- edc edd ede edk edo eds edt eec eed eee eek eeo ees eet ekc ekd eke eko eks ekt eo- eoc eod eoe eok eoo eos eot es- esc esd ese esk eso ess est etc etd ete etk eto ets ett k-t kcc kcd kce kck kcs kct kdc kde kdk kdo kds kdt ke- kec ked kee kek keo kes ket kkc kke kkk kks kkt koc kod koe kok koo kos kot ksc ksd kse ksk kso kss kst ktc kte ktk kto kts ktt oc- occ ocd ock oco ocs oct odc odd ode odo ods odt oec oed oee oeo oes oet okc okd oke okk oko oks oo- ooc ood ook ooo oos oot os- osc osd ose osk oso oss ost ot- otc otd ote otk oto ots ott scc scd sce sck sco scs sct sdc sdd sde sdk sdo sds sdt se- sec sed see sek seo ses set sk- skc skd ske skk sko sks skt soc sod soe sok soo sos sot ss- ssc ssd sse ssk sso sss sst stc std ste stk sto sts stt tcc tcd tce tck tco tcs tct tdc tdd tde tdk tdo tds tdt te- tec ted tee tek teo tes tet tkc tke tkk tko tks tkt to- toc tod toe tok too tos tot tsc tsd tse tsk tso tss tst ttc ttd tte ttk tto tts ttt